Fix for this issue is now available in the latest update of InDesign 2020 – that is, InDesign 15.1.2
In the Creative Cloud Desktop application, click on the Updates section on the left. You should be able to see the Update available for InDesign. Please update your InDesign application to this version to try out the fix.
Let us know in the comments section if you still face this problem.
Adobe InDesign Team
An error occurred while saving the commentMatt commented
Cannot export over existing PDFs on our SMB server. Error says "PDF is already open".
Looking at InDesign in Activity Monitor (macOS Mojave), it shows the name of each PDF I've exported in the list of "Open Files and Ports". Quitting InDesign or manually deleting the PDF from the Finder first seems to be only solutions. Exporting to local disks seem to release/close exported PDFs as expected.
3 votesMatt shared this idea ·
Please update InDesign to the latest version, InDesign CC 2018 (13.0) for the resolution of the issue.Matt supported this idea ·