I have an encrypted PDF file with OTP protection using AES-256 encryption and send to users through email as attachments.
These files opens successfully on:
MacOS (Catalina 10.15.3) - all browsers be it Safari or Chrome
These file open as blank on any mobile/ipad iOS as well as MacOS Document Viewer and right now testing is being performed on iPhone 7 running with 13.3.1 iOS. This has been tested in Chrome as well as Safari and even "Open With" option doesn't seem to be working at all:
iBooks -> it keeps on prompting password again & again;
Adobe Acrobat -> keep saying "Opening" with endless progress bar.
Only option working in iOS devices is of saving this file to device and then opening the same with Adobe Acrobat.
Any help/pointers towards solving this problem will be highly appreciable.