- Did you upload an XForm or XLSForm? Uploaded XForms are used as is. No XLSForm is generated from them.
- Are you using managed encryption? When Managed Encryption is in use, the XLSForm is never saved, not just when encryption is first enabled for the Project. There is an issue on Github about this and it was mentioned in Downloading XLSForm from Central - #6 by Matthew_White