[AC Question]

I don't want to delete all the photos that are "unsupported." How can I pick the ones I want to delete?

[SpookDroid]

Not sure I fully understand the issue, but you can choose any files to delete using the stock File Manager on your phone (or a 3rd party one as long as you don't need to modify contents on an SD card). Or you can connect your phone to a computer and manage the files from there.