[discussion moved to the Reader/Acrobat DC for mobile forum]
The old Adobe Reader mobile forums (such as the Adobe Reader for iOS forum, the Adobe Reader for Android forum, etc.) are now read-only for users.
Please move new discussions/questions to the new Reader/Acrobat DC for mobile forum instead. Thank you.
Acrobat DC for iOS does not provide an option to disable the auto-save feature. Sorry for the inconvenience.
Would it be possible for you to make a copy of a PDF form in advance and fill out the copy?