Hi @FRNZZZ ,
Thank you for taking the time to try the suggested troubleshooting steps. I understand how inconvenient this behavior can be, especially when it prevents you from saving changes to your PDF normally.
This appears to be related to a technical limitation involving the Preview Pane in Windows File Explorer.
When the Preview Pane is enabled and a PDF is selected, Windows Explorer loads the file to display its preview using a PDF preview handler. While doing so, Windows keeps an open handle to the PDF. Acrobat may interpret this as the file being in use by another process and, as a result, prevent changes from being saved directly to the original file.
As a workaround, please try disabling the Preview Pane in File Explorer:
File Explorer > View > Preview Pane, or press Alt + P.
Once the Preview Pane is disabled, you should be able to open, edit, and save the PDF in Acrobat without encountering this issue.
If you’d like to share your feedback with the product team or request an enhancement to this behavior, you can submit it through our Wish form.
Thank you again for your patience and understanding.
~Amal