PREVIEW application issue in Catalina 10.15 with supplemental update - SAVE AS PDF ISSUE - opened files in Preview, selected "save as" PDF I get an error message "error while printing" since upgrading to Catalina (including the supplemental update). I've tested various files on my iMac and also on an external hard drive - jpegs, screen shots, scanned documents - ranging from a single image to 23 images opened in Preview>Save As>PDF and always get the same error message "error while printing." Never had this issue before upgarding to Catalina 10.15. I've checked my "permissions" in Finder for example on files on my Desktop and it says "read and write" so I'm assuming it's not a Permissions issue. I've submitted this bug report to Apple Feedback - MacOS. IMPORTANT NOTE REGARDING A TEMPORARY FIX: A workaround is to go up to the Preview "File" menu and select "Export as PDF" but note that this reduces the final file size considerably (from a 100MB file of 23 images to 4MB) - so if you need it to remain a high quality image, do not use this. The link to submit feedback is here: https://www.apple.com/feedback/macos.html
Similar discussion thread here: https://discussions.apple.com/thread/250743000?page=1