The Problem is that Joplin has a hard coded timeout limit which is i think 120 seconds. This is not enough for very large attachments (except when using onedrive as in this case the attachments are uploaded in chunks). Joplin doesn't show all error message on the sidebar. See Why are some sync error messages not shown in the GUI?. You should read the log file and find large attachments which haven't been uploaded and delete them. Then the sync will work I guess.
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