Right now the picker defaults to single mode, it would be nice to be able to have a multi-mode, by passing a parameter when you launch it, then an array is returned of files instead of just one.

for android this might help speed things up
unique code

intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true);

full example

Intent intent = new Intent();
intent.setType("image/*");
intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true);
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent,"Select Picture"), 1);

for iOS I think maybe using this library might help, and seems up to date.

https://github.com/hackiftekhar/IQMediaPickerController