Problems syncing InDesign files using Cloud Documents

Hi, I contacted a support person directly at Adobe who has helped, thanks

It could be permissions, but if it worked fine for a year and suddenly stopped, it's more likely a sync service issue, a recent update, or a corrupted cloud document. try signing out and back into Creative Cloud, making sure the Creative Cloud app is up to date, and testing with a new document to narrow it down. That usually helps identify whether it's the file or the sync service itself.

Can you please elaborate on what you mean by “syncing indesign files to Creative Cloud”? Are you referring to “cloud documents”? If so, then what kind of issues specifically do you experience?