Adobe Acrobat Pro Split Document Error Message

Hi @jx_32501,

Sorry for the delayed response and troubled experience.

I'm following up to check if your issue is resolved. Please let us know if not; we'd be happy to help.

If possible, please share the file with us, and we will try to find the root cause. Also, is this happening with all the files or just one file? 

Thank you for reporting this issue to us and for your patience.

~Tariq

By the way, the following pages were NOT helpful:

https://community.adobe.com/t5/acrobat-discussions/error-the-file-may-be-a-read-only-or-another-user-has-it-open/m-p/9544003

https://helpx.adobe.com/reader/using/protected-mode-windows.html

https://helpx.adobe.com/acrobat/kb/unable-to-save-pdf-windows-10.html#:~:text=When%20you%20save%20a%20PDF%20in%20Acrobat%20on,access%20setting%20in%20Windows%2010%20to%20allow%20Acrobat

https://learn.microsoft.com/en-us/defender-endpoint/controlled-folders

Still looking for answers...