How to fix the “cannot be autosaved” bug when saving documents in macOS apps

An oddball problem with an oddball fix and some workarounds.
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Apple
    Related:
  • MacOS
  • Mac
Glenn Fleishman’s most recent books include Take Control of iOS & iPadOS Privacy and Security, Second Edition (covering iOS 15/iPadOS 15), Take Control of Your M-Series Mac, and Take Control of Securing Your Mac. In his spare time, he makes Tiny Type Museums. He’s a senior contributor to Macworld, where he writes Mac 911.