Hello, I wonder if there are any PDF applications that can make changes (highlights or comments, for example) to a file on the SD card, that is to say, without making an internal-drive copy and editing that instead. I believe it's possible but hard for the app coders to do and usually they don't bother.
However I hope someone has bothered because it's very annoying. (I don't know why this additional layer of security was necessary in the first place, or why an SD card needs to be protected when the internal isn't, way back when Android 5.0 was released.)
So far I've checked Moon Reader (can only make an internal copy), Foxit (can only make an internal copy), Adobe Reader (can only make an internal copy).
Anything you folks know of?
