Uploaded documents to SP from synced file explorer folder gives error messages

[tgillis]

HELP! 

We've created a SharePoint team site and another site owner gets either "the file name you specified is not valid or too long" or "available only online" when she uploads any document through a synced folder in file explorer. Is it her OneDrive or a SharePoint setting?

[#2]

Depending on the length of the site name, library name + folder(s) + file name, it could be longer than allowed for sync. Here's some info on the limits https://support.microsoft.com/en-us/office/restrictions-and-limitations-in-onedrive-and-sharepoint-6...