Bug In Editable Documents tracking

[CoastLineModels]

This is getting pretty frustrating. I open a document from the 'My Editable documents ' list in the Data panel, and edit a design - but it will not let me save the design! Sometimes it will let me Save As, but today it wouldn't so I started looking at options as I didn't particularly want to have to redo all the edits I'd just made. 
So I made the document Read Only, then went to make it editable again only to be greeted by the Message "This Document does not appear to be associated with a Hub and cannot be activated" 

Great, So that's half an hour of design work gone into oblivion.  🙄

[CoastLineModels]

Some more button pressing...I tried to open the document from the screen above, and that moved it to the top of the recent list and marked it as editable. It also removed the "This is a sample document" banner at the top of the workspace but didn't reinstate the greyed out save command. 

If I close the document it asks me if I want to save changes, so I'm hoping it does ...but no, it didn't. Great. So I'm going to have to do all the design work again. 

[jeff_strater]

I am not an expert on the editable documents stuff at all, so I have no idea what is going on with this design.  But, as a way to preserve your work, can you try Exporting it as "Fusion Archive (f3d)"?   This will save the design to your local disk - you can then upload it to your hub.

[CoastLineModels]

It's no just this design. This has happened at least half a dozen times now across all projects.