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What Does "The document “[file name]” is on a volume that does not support permanent version storage." Mean?

Since I updated my MacBook to macOS Big Sur, I can't save files onto an exFAT USB drive. I've tried multiple hard drives, even tried another MacBook Pro 2020, but nothing works, it says "The document "[name of the document]" could not be saved." It has nothing to do with the file extension. I've also tried to erase/format all the USB drives, nothing helps. Besides this another kind of window pops up that says "The document “[file name]” is on a volume that does not support permanent version storage."? If I try to open the file with another application, Sublime Text, for example, it works without any problem, with or without the file extension. I've tried all of the "basic" solutions like restarting my computer, formatting the USB, changing the USB adapter dongle, etc. nothing works.