I do have a few of my Excel files on OneDrive. Some have linked data to excel files outside of OneDrive. I have migrated recently to another laptop (both Mac's). I haven't probably paid properly attention and activate autosave. I don't if for this reason or another my links to those files outside of OneDrive are replace with a http link to a file, which actually doesn't exist. Hence every time I open the file Excel suggest to edit the links. I change the source. But when I save, it all falls back to the http links.