@dfox there should be two more options here about paste and copy here.
There is action you must specify in Android marshmallow within your intent-filter "ACTION_PROCESS_TEXT". I am not sure which language you are using but this should fix it.

Thanks, will try that out!

I'm testing this on the Android emulator with 5X running 7.0 and can't reproduce. I see the same thing you do, where "select all" comes up, but when I tap that I get options for cut, copy, and paste. process_text is for adding specific functionality. I can't find any documentation saying that copy and paste should need anything special.