store big file like photos

I have read the demo of  todo app's demo: todo-app-using-djinni-and-sqlite.
It's great.
And I have a question:
If the app need store many big files like photos. How should i to manage the photo files .Use sqlite to store them  i think is will be slow in storage and read.
Should i need import another c++ file manage lib to manage big files .So android and ios could use it both?
Thanks a lot!
