Hi,
This is checked yes. It has to be active to enable AutoSave.
1. Not all.
2. For now on just Excel, but we have very few Word. As I don't know how to reproduce the error, I cannot try unfortunately.
3. What's the checked out state? From my point of view, they just open files by double-click (Win Explorer/OneDrive) or click > Open in App (Online)
4. Microsoft Office 365 ProPlus
I want to add more details. After posting here, I found out how to hard-delete the Office Caches.
https://answers.microsoft.com/en-us/msoffice/forum/all/upload-failed-attempting-to-access-sharepoint/dd893050-ec49-409b-9343-e523d1556a87?page=2
By removing the contents of
%LocalAppData%/Microsoft/Office/15.0 [or 16.0]/OfficeFileCache
and
/MruServiceCache
Then Excel is forced to redownload all information from the Cloud and it works again... but not for long. After some editions from the user and others, the errors come back. You'll agree, it should not be the permanent solution.
These problematic files are used by up to a dozen of people at different moments of the day, sometimes at the same moment. It can be that OneDrive Sync and Excel (probably also Office products) Cache do not keep up with all the changes.
A few more information:
I asked a colleague to open one of the file that hasn't been modified today.
The Excel opens but AutoSave is disabled (in the Options/Save/First line is checked, AutoSave should be ON when possible as default).
On the top, the status is "Saving in Progress". But it never ends.
We try to activate the AutoSave manually on the top left button, but nothing change.
After a few minutes, AutoSave disables itself and the error shows:
"Saving not possible, there is a problem with saving the file".
The following feature is also enabled on the Sharepoint Site:
SharePoint Server Enterprise Site Collection features
Features such as InfoPath Forms Services, Visio Services, Access Services, and Excel Services Application, included in the SharePoint Server Enterprise License.
I am now disabling it and see if it has an impact.