No thanks
This is just another sad attempt by Adobe to get you to switch to their cloud services.
I feel sorry for the developers that had to keep this app as dysfunctional as possible to satisfy the marketing department. Its an embarrassment.
There are much better alternatives for iOS. PDF Expert and GoodReader are two examples.
Sidyrm about
Adobe Acrobat Reader: Annotate, Scan, & Send PDFs, v16.07.19