Cannot open encryted pdf on phone
One of the screenshots that you shared with us privately indicated that your PDF document is a special type of PDF called "dynamic XFA".
Acrobat Reader mobile apps (for iOS and Android) do not support dynamic XFA documents.
Please take a look at the other post with the same issue.
Please use the desktop version of Acrobat Reader on a Windows or Mac computer to open dynamic XFA documents.
Sorry for the inconvenience.
I tried to add the screenshot, could not get it done. Fo you have a separate email that I could send it to?
The file require a password to open, supply a dialog box for password to be entered in and then a message that it might not be able to open file.
In general, Acrobat Reader for iOS can open encrypted PDF documents for viewing.
I suspect that you have a special type of PDF document.
For example, your PDF document may be protected by DRM (Digital Rights Management) by third-parties (such as Vitrium).
Do you see an error message or a dialog prompting for username & password when you try opening the PDF document?
Would you please attach a screenshot in your next reply?
Thank you for your help.