Hello Lars Aeschbacher and welcome to the Microsoft Community
According to your feedback, you are experiencing saving a pdf with the message “Unable to save document. The file may be read-only or another user may have opened it. Please save the document under a different name or in a different folder”.
There are many reasons for this problem, you need to troubleshoot, you can test the following methods
- Close the preview:
If you are in the local PDF changes or editing the appearance of this error message then
then this problem may be due to the preview of the Explorer led to the
Previously by the user feedback through this method to solve the problem, you can try it!
Go to Explorer > At the top of the File Explorer window, click on the “View” tab > On the right side of the “View” tab, find the “Preview Pane” option and click to Uncheck the box, this will disable the file preview function, then you see if you can solve the problem.
- Check the file permissions:
Make sure you have permission to modify and save the PDF file.
If the file is read-only, you need to change the file permissions to save the changes!
method:
1. Check the file properties:
Right-click on the PDF file and select “Properties”.
In the General tab, make sure the Read Only property is unchecked. If it is checked, uncheck it and click “Apply”.
2. Change folder permissions:
Right-click on the folder containing the PDF file and select “Properties”.
Go to the “Security” tab and click the “Edit” button.
Select your user account and then make sure that the “Full Control” permission is allowed. Click “Apply” and “OK”.
Or some PDF is encrypted by the password file, you need to cancel the encryption first.
Use the PDF Editor:
Open the PDF file.
If the file is password protected, you will need to enter the password to unprotect it.
In Adobe Acrobat, click on the File menu and select Properties.
Go to the Security tab and select No Security or change the permission settings.
Save the changes.
- Save as a new file:
If the original file cannot be saved, try saving the changes as a new PDF file.
This can usually be achieved through the “Save As” function, you can directly select Save As to save to another path to try!
- Check for file corruption:
If the PDF file itself is corrupted, you may not be able to save the changes.
Try to use PDF repair tools to repair the file, and then save!
Or you can try again to change the PDF format to word format, and then change back to pdf format is a bit.
We look forward to hearing from you.
Kirito|Microsoft Community Support Specialist