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Edit option is not working properly
Hope you are doing well. Sorry for your experience with Acrobat Reader Mobile.
Does the document you are trying to edit consist of Scans or images? If yes, you will not be able to make edits like standard text PDFs as they are recognized as image files.
To edit scans and images, you will need to use Adobe Scan to make any markups or clearances of unwanted information.
You can reference from the given link to learn more: Scan — Adobe Scan for Android
Hope this helps.