[Help] What app should I use?

[MXD77]

What do you mean?
Maybe paint.net or gimp

[CommanderABab]

I use Joint Pics if you mean concatenation of the images.

[CommanderABab]

I copy all files to a directory named aaaaa something in the root directory, so that I can load an album and select images easily without scrolling all gallery pictures on my device.

[realfakenerd]

Gimp and Paint.NET is good, but it's for PC, anyone knows a good app for a very mobile user? I've found some, but I don't know what app to choose.