We are agreed as to the symptoms. No matter what kind of edit, in particular highlighting in this instance, the edited file ends up in a storage area that we can't find using file manager even when connected to a PC. Not having developed the software, I have no knowledge of how the particular storage folder is generated that we can't find. I am totally ignorant about the Adobe software that generates this folder and its relationship or compatibility with Android version 6.0. That's about as far as I can get on this. Perhaps the entire issue needs to be reviewed by those having developed this software in the first place. Thank you.
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