diff --git a/services_app/src/main/java/org/opendatakit/services/MainActivity.java b/services_app/src/main/java/org/opendatakit/services/MainActivity.java
index e02f8adb1..240e8d6f4 100644
--- a/services_app/src/main/java/org/opendatakit/services/MainActivity.java
+++ b/services_app/src/main/java/org/opendatakit/services/MainActivity.java
@@ -140,6 +140,14 @@ public boolean onOptionsItemSelected(MenuItem item) {
       return true;
     }
 
+    if (id == R.id.action_redownload) {
+      Intent i = new Intent(this, SyncActivity.class);
+      i.putExtra(IntentConsts.INTENT_KEY_APP_NAME, getAppName());
+      i.putExtra(IntentConsts.INTENT_KEY_REDOWNLOAD_ATTACHMENT, "true");
+      startActivityForResult(i, SYNC_ACTIVITY_RESULT_CODE);
+      return true;
+    }
+
     if (id == R.id.action_about) {
 
       FragmentManager mgr = getSupportFragmentManager();
diff --git a/services_app/src/main/java/org/opendatakit/services/sync/actions/SyncActions.java b/services_app/src/main/java/org/opendatakit/services/sync/actions/SyncActions.java
index 854ddb31b..c52e6f05a 100644
--- a/services_app/src/main/java/org/opendatakit/services/sync/actions/SyncActions.java
+++ b/services_app/src/main/java/org/opendatakit/services/sync/actions/SyncActions.java
@@ -4,5 +4,5 @@
  * @author mitchellsundt@gmail.com
  */
 public enum SyncActions {
-  IDLE, MONITOR_SYNCING, SYNC, RESET_SERVER
+  IDLE, MONITOR_SYNCING, SYNC, RESET_SERVER, RE_DOWNLOAD
 }
diff --git a/services_app/src/main/java/org/opendatakit/services/sync/actions/fragments/SyncFragment.java b/services_app/src/main/java/org/opendatakit/services/sync/actions/fragments/SyncFragment.java
index daeb3e384..9dd684aab 100644
--- a/services_app/src/main/java/org/opendatakit/services/sync/actions/fragments/SyncFragment.java
+++ b/services_app/src/main/java/org/opendatakit/services/sync/actions/fragments/SyncFragment.java
@@ -148,6 +148,14 @@ public SyncFragment() {
       }
     }
 
+    String re_download = getActivity().getIntent().getStringExtra(IntentConsts.INTENT_KEY_REDOWNLOAD_ATTACHMENT);
+    WebLogger.getLogger(getAppName())
+            .w(TAG, "re_download is :" + re_download);
+
+    if (re_download != null) {
+      reDownload();
+    }
+
     ArrayAdapter<CharSequence> instanceAttachmentsAdapter = ArrayAdapter
         .createFromResource(getActivity(), R.array.sync_attachment_option_names, android.R.layout.select_dialog_item);
     syncInstanceAttachmentsSpinner.setAdapter(instanceAttachmentsAdapter);
@@ -309,6 +317,17 @@ void postTaskToAccessSyncService() {
                   }
                 });
                 break;
+              case RE_DOWNLOAD:
+                syncServiceInterface.synchronizeWithServer(getAppName(), SyncAttachmentState.RE_DOWNLOAD);
+                syncAction = SyncActions.MONITOR_SYNCING;
+
+                handler.post(new Runnable() {
+                    @Override public void run() {
+                        showProgressDialog(SyncStatus.NONE, null, getString(R.string.sync_starting), -1,
+                                0);
+                    }
+                });
+                break;
               case RESET_SERVER:
                 syncServiceInterface.resetServer(getAppName(), syncAttachmentState);
                 syncAction = SyncActions.MONITOR_SYNCING;
@@ -479,6 +498,29 @@ public void onClickChangeUser(View v) {
     return;
   }
 
+  private void reDownload() {
+    WebLogger.getLogger(getAppName()).d(TAG, "[" + getId() + "] [onClickReDownload] timestamp: " + System.currentTimeMillis());
+    if (areCredentialsConfigured(false)) {
+      // show warning message
+      //TODO: make some error message here
+      AlertDialog.Builder msg = buildOkMessage("confirm re-download attachments",
+              "re-download will result in high data usage");
+
+      msg.setPositiveButton(getString(R.string.sync_reset), new DialogInterface.OnClickListener() {
+        @Override public void onClick(DialogInterface dialog, int which) {
+          WebLogger.getLogger(getAppName()).d(TAG,
+                  "[" + getId() + "] [onClickReDownload] timestamp: " + System.currentTimeMillis());
+          disableButtons();
+          syncAction = SyncActions.RE_DOWNLOAD;
+          prepareForSyncAction();
+        }
+      });
+
+      msg.setNegativeButton(getString(R.string.cancel), null);
+      msg.show();
+    }
+  }
+
   private void showProgressDialog(SyncStatus status, SyncProgressState progress, String message,
       int progressStep, int maxStep) {
     if (getActivity() == null) {
diff --git a/services_app/src/main/java/org/opendatakit/services/sync/service/logic/AggregateSynchronizer.java b/services_app/src/main/java/org/opendatakit/services/sync/service/logic/AggregateSynchronizer.java
index e5a82d415..50c452fd2 100644
--- a/services_app/src/main/java/org/opendatakit/services/sync/service/logic/AggregateSynchronizer.java
+++ b/services_app/src/main/java/org/opendatakit/services/sync/service/logic/AggregateSynchronizer.java
@@ -1053,14 +1053,20 @@ public void uploadInstanceFileBatch(List<CommonFileAttachmentTerms> batch,
   @Override
   public void downloadInstanceFileBatch(List<CommonFileAttachmentTerms> filesToDownload,
       String serverInstanceFileUri, String instanceId, String tableId) throws HttpClientWebException, IOException {
-    // boolean downloadedAllFiles = true;
+    downloadInstanceFileBatch(filesToDownload, serverInstanceFileUri, instanceId, tableId, false);
+  }
 
+  @Override
+  public void downloadInstanceFileBatch(List<CommonFileAttachmentTerms> filesToDownload,
+      String serverInstanceFileUri, String instanceId, String tableId, boolean reduce) throws HttpClientWebException, IOException {
+    // boolean downloadedAllFiles = true;
     URI instanceFilesDownloadUri = wrapper.constructInstanceFileBulkDownloadUri(serverInstanceFileUri, instanceId);
 
     ArrayList<OdkTablesFileManifestEntry> entries = new ArrayList<OdkTablesFileManifestEntry>();
     for (CommonFileAttachmentTerms cat : filesToDownload) {
       OdkTablesFileManifestEntry entry = new OdkTablesFileManifestEntry();
       entry.filename = cat.rowPathUri;
+      entry.reduceFileSize = reduce ? "t" : "f";
       entries.add(entry);
     }
 
diff --git a/services_app/src/main/java/org/opendatakit/services/sync/service/logic/HttpSynchronizer.java b/services_app/src/main/java/org/opendatakit/services/sync/service/logic/HttpSynchronizer.java
index 362bf6720..80a33caba 100644
--- a/services_app/src/main/java/org/opendatakit/services/sync/service/logic/HttpSynchronizer.java
+++ b/services_app/src/main/java/org/opendatakit/services/sync/service/logic/HttpSynchronizer.java
@@ -371,6 +371,20 @@ void downloadInstanceFileBatch(List<CommonFileAttachmentTerms> filesToDownload,
                                  String serverInstanceFileUri, String instanceId, String tableId)
       throws HttpClientWebException, IOException;
 
+
+  /**
+   * @param filesToDownload
+   * @param serverInstanceFileUri
+   * @param instanceId
+   * @param tableId
+   * @param reduce
+   * @throws HttpClientWebException
+   * @throws IOException
+   */
+  void downloadInstanceFileBatch(List<CommonFileAttachmentTerms> filesToDownload,
+                                 String serverInstanceFileUri, String instanceId, String tableId, boolean reduce)
+          throws HttpClientWebException, IOException;
+
   /**
    * Report the sync status for this device to the server
    * @param tableResource
diff --git a/services_app/src/main/java/org/opendatakit/services/sync/service/logic/ProcessManifestContentAndFileChanges.java b/services_app/src/main/java/org/opendatakit/services/sync/service/logic/ProcessManifestContentAndFileChanges.java
index 37dd388ef..f4a580e31 100644
--- a/services_app/src/main/java/org/opendatakit/services/sync/service/logic/ProcessManifestContentAndFileChanges.java
+++ b/services_app/src/main/java/org/opendatakit/services/sync/service/logic/ProcessManifestContentAndFileChanges.java
@@ -868,7 +868,9 @@ public boolean syncRowLevelFileAttachments(String serverInstanceFileUri, String
       log.i(LOGTAG, "syncRowLevelFileAttachments no files to send to server -- they are all synced");
       fullySyncedUploads = true;
     } else if (attachmentState.equals(SyncAttachmentState.SYNC) ||
-        attachmentState.equals(SyncAttachmentState.UPLOAD)) {
+        attachmentState.equals(SyncAttachmentState.UPLOAD) ||
+        attachmentState.equals(SyncAttachmentState.REDUCED_SYNC) ||
+        attachmentState.equals(SyncAttachmentState.RE_DOWNLOAD)) {
       long batchSize = 0;
       List<CommonFileAttachmentTerms> batch = new LinkedList<CommonFileAttachmentTerms>();
       for (CommonFileAttachmentTerms fileAttachment : filesToUpload) {
@@ -903,10 +905,14 @@ public boolean syncRowLevelFileAttachments(String serverInstanceFileUri, String
       log.i(LOGTAG, "syncRowLevelFileAttachments no files to fetch from server -- they are all synced");
       fullySyncedDownloads = !impossibleToFullySyncDownloadsServerMissingFileToDownload;
     } else if (attachmentState.equals(SyncAttachmentState.SYNC) ||
-        attachmentState.equals(SyncAttachmentState.DOWNLOAD)) {
+            attachmentState.equals(SyncAttachmentState.UPLOAD) ||
+            attachmentState.equals(SyncAttachmentState.REDUCED_SYNC) ||
+            attachmentState.equals(SyncAttachmentState.RE_DOWNLOAD)) {
       long batchSize = 0;
       List<CommonFileAttachmentTerms> batch = new LinkedList<CommonFileAttachmentTerms>();
 
+      boolean reduce = attachmentState.equals(SyncAttachmentState.REDUCED_SYNC);
+
       for (CommonFileAttachmentTerms fileAttachment : filesToDownloadSizes.keySet()) {
 
         // Check if adding the file exceeds the batch limit. If so, download the current batch
@@ -916,8 +922,8 @@ public boolean syncRowLevelFileAttachments(String serverInstanceFileUri, String
         if (batchSize + filesToDownloadSizes.get(fileAttachment) > MAX_BATCH_SIZE &&
             !batch.isEmpty()) {
           log.i(LOGTAG, "syncRowLevelFileAttachments downloading batch for " + instanceId);
-          sc.getSynchronizer().downloadInstanceFileBatch(batch,
-              serverInstanceFileUri, instanceId, tableId);
+          HttpSynchronizer httpSynchronizer = (HttpSynchronizer) sc.getSynchronizer();
+          httpSynchronizer.downloadInstanceFileBatch(batch, serverInstanceFileUri, instanceId, tableId, reduce);
           batch.clear();
           batchSize = 0;
         }
@@ -929,8 +935,8 @@ public boolean syncRowLevelFileAttachments(String serverInstanceFileUri, String
       if ( !batch.isEmpty() ) {
         // download the final batch
         log.i(LOGTAG, "syncRowLevelFileAttachments downloading batch for " + instanceId);
-        sc.getSynchronizer().downloadInstanceFileBatch(batch, serverInstanceFileUri,
-            instanceId, tableId);
+        HttpSynchronizer httpSynchronizer = (HttpSynchronizer) sc.getSynchronizer();
+        httpSynchronizer.downloadInstanceFileBatch(batch, serverInstanceFileUri, instanceId, tableId, reduce);
       }
 
       fullySyncedDownloads = !impossibleToFullySyncDownloadsServerMissingFileToDownload;
diff --git a/services_app/src/main/java/org/opendatakit/services/sync/service/logic/ProcessRowDataSyncAttachments.java b/services_app/src/main/java/org/opendatakit/services/sync/service/logic/ProcessRowDataSyncAttachments.java
index f629e4903..1a8254803 100644
--- a/services_app/src/main/java/org/opendatakit/services/sync/service/logic/ProcessRowDataSyncAttachments.java
+++ b/services_app/src/main/java/org/opendatakit/services/sync/service/logic/ProcessRowDataSyncAttachments.java
@@ -138,8 +138,14 @@ public void syncAttachments(TableResource tableResource,
 
 
         String sqlCommand;
-        BindArgs bindArgs = new BindArgs(new Object[]{ SyncState.in_conflict.name(),
-            SyncState.synced_pending_files.name() });
+        BindArgs bindArgs;
+        if (attachmentState.equals(SyncAttachmentState.RE_DOWNLOAD)) {
+          bindArgs = new BindArgs(new Object[]{SyncState.synced.name(),
+              SyncState.synced_pending_files.name()});
+        } else {
+          bindArgs = new BindArgs(new Object[]{ SyncState.in_conflict.name(),
+              SyncState.synced_pending_files.name() });
+        }
 
         {
           StringBuilder sqlCommandBuilder = new StringBuilder();
@@ -239,7 +245,8 @@ public void syncAttachments(TableResource tableResource,
             boolean syncAttachments = false;
             // the local row wasn't impacted by a server change
             // see if this local row should be pushed to the server.
-            if (state == SyncState.in_conflict) {
+            if (state == SyncState.in_conflict ||
+                (state == SyncState.synced && attachmentState.equals(SyncAttachmentState.RE_DOWNLOAD))) {
               if (!fileAttachmentColumns.isEmpty()) {
                 // fetch the file attachments for an in_conflict row but don't delete
                 // anything and never update the state to synced (it must stay in in_conflict)
@@ -299,6 +306,7 @@ public void syncAttachments(TableResource tableResource,
                 idString = R.string.sync_skipping_attachments_server_row;
                 break;
               case SYNC:
+              case REDUCED_SYNC:
                 idString = R.string.sync_syncing_attachments_server_row;
                 break;
               case UPLOAD:
diff --git a/services_app/src/main/res/menu/main.xml b/services_app/src/main/res/menu/main.xml
index 0e0944a0b..7b19d5f36 100644
--- a/services_app/src/main/res/menu/main.xml
+++ b/services_app/src/main/res/menu/main.xml
@@ -38,6 +38,13 @@
             android:title="@string/action_change_user"
             app:showAsAction="ifRoom" />
 
+    <item
+        android:id="@+id/action_redownload"
+        android:orderInCategory="50"
+        android:icon="@drawable/ic_cached_black_24dp"
+        android:title="@string/action_redownload"
+        app:showAsAction="ifRoom" />
+
     <item
             android:id="@+id/action_about"
             android:orderInCategory="100"
diff --git a/services_app/src/main/res/values-es/arrays.xml b/services_app/src/main/res/values-es/arrays.xml
index dcfacb509..36f193a22 100644
--- a/services_app/src/main/res/values-es/arrays.xml
+++ b/services_app/src/main/res/values-es/arrays.xml
@@ -15,11 +15,13 @@
         <item>UPLOAD</item>
         <item>DOWNLOAD</item>
         <item>NONE</item>
+        <item>REDUCED_SYNC</item>
     </string-array>
     <string-array name="sync_attachment_option_names">
         <item>Sincronizar Todos</item>
         <item>Solo enviar archivos (imágenes, audio, video) al servidor</item>
         <item>Solo recibir archivos (imágenes, audio, video) del servidor</item>
         <item>No sincronizar archivos</item>
+        <item> </item>
     </string-array>
 </resources>
diff --git a/services_app/src/main/res/values-es/strings.xml b/services_app/src/main/res/values-es/strings.xml
index 410007475..74347385f 100644
--- a/services_app/src/main/res/values-es/strings.xml
+++ b/services_app/src/main/res/values-es/strings.xml
@@ -9,6 +9,7 @@
     <string name="action_sync">Sincronización</string>
     <!--<string name="action_logout">Logout</string>-->
     <string name="action_change_user">Cambiar usuario/Cerrar sesión</string>
+    <string name="action_redownload"></string>
     <string name="action_resolve_conflict">Resolver Conflictos</string>
     <string name="action_verify_server_settings">Actualizar permisos de usuario</string>
     <!-- Checkpoint and Conflict Resolution Stuff -->
@@ -165,6 +166,7 @@
     <string name="sync_defer_instance_files">Sincronizar archivos adjuntos de la instancia más tarde</string>
     <string name="sync_start">Sincronizar Ahora</string>
     <string name="sync_reset_server">Reinicializar servidor</string>
+    <string name="sync_redownload"> </string>
     <string name="sync_confirm_change_settings">Confirmar cambios de configuración</string>
     <string name="sync_change_settings_warning">Si cambia su configuración, tablas que han sincronizado ahora pueden ya no ser capaces de sincronizar en el futuro.</string>
     <string name="sync_save">Guardar</string>
@@ -199,7 +201,7 @@
     <string name="sync_notification_success_pending_attachments_text">\"Sincronización completado, pero %1$d tabulas tienen filas con archivos que no se han sincronizaido completamente.</string>
     <string name="sync_status_network_transport_error">Error de red.\nPor favor confirme que el dispotivo tiene acceso al servidor.</string>
     <string name="sync_status_device_internal_error">Error interno. \n Por favor, enviar un informe de error</string>
-    <string name="sync_status_authentication_error">Error de autenticación. \nPlease verificar su 
+    <string name="sync_status_authentication_error">Error de autenticación. \nPlease verificar su
         nombre de usuario/contraseña o su cuenta de acceso.</string>
     <string name="sync_status_internal_server_error">Error interno del servidor (500). \nPor favor notificar al administrador del servidor.</string>
     <string name="sync_status_bad_gateway_or_client_config">WiFi Gateway o Error de configuración. \nPor favor verificar la URL del servidor y que el navegador del dispositivo puede acceder a su servidor.</string>
diff --git a/services_app/src/main/res/values/arrays.xml b/services_app/src/main/res/values/arrays.xml
index 31021db5c..1d598456c 100644
--- a/services_app/src/main/res/values/arrays.xml
+++ b/services_app/src/main/res/values/arrays.xml
@@ -15,11 +15,13 @@
         <item>UPLOAD</item>
         <item>DOWNLOAD</item>
         <item>NONE</item>
+        <item>REDUCED_SYNC</item>
     </string-array>
     <string-array name="sync_attachment_option_names">
         <item>Fully Sync Attachments</item>
         <item>Upload Attachments Only</item>
         <item>Download Attachments Only</item>
         <item>Do Not Sync Attachments</item>
+        <item>Sync Reduced-size Attachments</item>
     </string-array>
 </resources>
\ No newline at end of file
diff --git a/services_app/src/main/res/values/strings.xml b/services_app/src/main/res/values/strings.xml
index 3ed99d984..f6ebd3c67 100644
--- a/services_app/src/main/res/values/strings.xml
+++ b/services_app/src/main/res/values/strings.xml
@@ -9,6 +9,7 @@
     <string name="action_sync">Sync</string>
     <!--<string name="action_logout">Logout</string>-->
     <string name="action_change_user">Change User/Logout</string>
+    <string name="action_redownload">re-Download attachments</string>
     <string name="action_resolve_conflict">Resolve Conflicts</string>
     <string name="action_verify_server_settings">Update User Permissions</string>
 
@@ -195,6 +196,7 @@
     <string name="sync_defer_instance_files">Defer Instance Attachments</string>
     <string name="sync_start">Sync now</string>
     <string name="sync_reset_server">Reset App Server</string>
+    <string name="sync_redownload">Re-download Attachments</string>
 
     <string name="sync_confirm_change_settings">Confirm Change Settings</string>
     <string name="sync_change_settings_warning">If you change your settings, tables you have sync\'d now may no longer be able to be sync\'d.</string>