Acrobat Pro on macOS Tahoe – Cannot open multiple PDFs due to false permission errors

Acrobat Pro on macOS Tahoe – Cannot open multiple PDFs due to false permission errors

I'm experiencing a frustrating bug in Adobe Acrobat Pro on macOS Tahoe 26.7.1.

The issue:

When I open a PDF from our Synology Drive, the first file opens perfectly fine. However, when I try to open a second PDF, even from the exact same folder, Acrobat displays the following error:

"The operation could not be completed as Adobe Acrobat doesn't have permission to access [folder path]. Launch privacy settings to grant access?"

How to reproduce:

1. Completely quit Adobe Acrobat.

2. Open any PDF from Synology Drive. It works.

3. Try opening another PDF from the same folder. Acrobat displays a permission error.

4. Quit Acrobat completely and reopen the second PDF. It now opens successfully.

5. Try opening the first PDF again. The permission error returns.

The problem depends entirely on which PDF is opened first, not on the file itself.

System:

• MacBook Pro M4 Pro

• macOS Tahoe 26.7.1

• Adobe Acrobat Pro (latest version)

• Synology Drive via macOS File Provider

Already tried:

• Enabling Full Disk Access for Acrobat

• Granting Files & Folders permissions

• Resetting macOS privacy permissions

• Disabling Enhanced Security in Acrobat

• Restarting Acrobat

None of these solutions fixed the issue.

This is seriously disrupting my daily workflow. I work with multiple PDFs throughout the day, and having to completely quit Acrobat every time I need to open another file is unacceptable.

Is Adobe aware of this bug? Is there a confirmed fix or workaround available?