Random "The document could not be autosaved. You don't have permission." messages despite having permissions

Since I got a new computer, I'm getting the following message all the time in TeXShop (same version I had on my old computer): > The document could not be autosaved. You don't have permission. This means my documents aren't being autosaved for some reason. But it gets worse. When I try to save a document, a lot of the time I get the following message: > The document "[documentname]" could not be saved. The file is locked. Do you want to save your changes to it anyway? If I click on "Save anyway", I get the following message: > You don't have permission to save the file "[documentname]" in the folder "[foldername]". To view or change permissions, select the item in the Finder and choose File > Get Info. I have all of my personal documents on custom folders in my iCloud Drive. All of my folders and the documents therein have permissions set up such that I can read and write. (The answers [here](https://apple.stackexchange.com/questions/37238/the-document-x-could-not-be-saved-you-don-t-have-permission) and [here](https://apple.stackexchange.com/questions/70421/the-document-x-could-not-be-autosaved-you-don-t-have-permission) are therefore useless to me.) I've also checked the permissions of ~/Library/"Autosave Information", and I can read and write there as well. I didn't have this problem *with the same files* on my old computer. I migrated everything to my new computer with Time Machine, which shouldn't mess with permissions, but, as stated above, I've checked my permissions anyway and they're fine. I don't know whether the problem is a Monterey issue (I had Catalina on my old computer), an Apple-Silicon issue (current computer is M1 Max, previous computer was Intel) or something else. Please help.