I have a collection of PDFs sync'd to my device via another app (Mendeley). I choose to open a PDF from this app using Acrobat Reader. Annotations are made. I leave Reader and return to Mendeley only to find the PDF in Mendeley's respository does not contain the annotations I made in Reader. I open the file again from Mendeley and it opens up a file in Reader with a "-1" appended to the end, i.e. file-1.pdf where file.pdf was the original name. I back out to Reader's recent list, and it has file-1 and file both listed. Opening file from the recent list displays the annotated version. This is the only way I can find the annotated file. I then turn to Samsung's My Files app. Searching reveals file.pdf in the Mendeley managed repository (simply a folder in the Internal Storage) but no file-1.pdf. If I open file.pdf from My Files in Reader, it has no annotations. If I back out to Reader's recent list, I now see 3 files: file-1.pdf (with no annotations) and TWO file.pdf - one with annotations and one without. This is a brand new Android device - about a week of use. Where is the annotated file stored? After finished annotating, can Reader write the changes to the original file? Thanks!
Tablet: Samsung Galaxy Tab A (2019, 10.1", Wi-Fi), model SM-T510