Though since v1.10.x various error messages when Saving a document happen 1-2 times a week and often seem to end up with a "corrupted document", I am most often able to either open the file after app relaunch or at least get the lost pages from the corrupted document via "Add Pages From File" into the previous file version from a backup.
Unfortunately this time it doesn't work. Since I lost a few hours work: @Dan C, could you please try to make recent pages, at least page 336 available from the attached .afpub (95 MB)? Thank You! twitter - save-failed-corrupt_221109-1747.afpub
(.afpub + all linked resources + macOS are all stored on 1 internal SSD, no other disk or external volume is involved)