Keep files on my device has crashed Windows 10

Mike Williams 

Thank you for taking the time to reply: I much appreciate it.

On local repairs, I ran chkdsk c: /f from a cmd prompt safe reboot and it found 0 unindexed files, and failed to write the event log with 'status 6'. Same on repeat so I ran chkdsk c: /r with the same result. My uneducated theory: at a higher level there's double entry of multiple files, but at CMD level empty reserved space for OD is acceptable. In Win10 Explorer is still strangled. What should I try next: can I force a rebuild of Explorer's file directory? I'm most interested in what to try next.
Thanks in advance Mike.

Below just answers your questions.  What I did was demonstrably wrong: it just lets you know what a user with half the pictrue might do.

On deleting files, there was only one. With C: brimmed, I was thinking that windows had no working disk space and this would cause issues. I confirmed that a 4Gb dashcam file was backed up and then deleted only that. I don’t have control over Windows Explorer yet so I can’t check what my OD folder says about accounts, but if I run up the OD App it reports not signed in with a grey cloud and strikethrough (systray) so I think it can’t be sync’ing.

You are right about more allocated than physical space. Whilst Explorer is overloaded, Ace Utilities will analyse my disc. Users\[Me]\Documents folder is emptied but had a subfolder, \Pictures is gone so I assume uploaded, emptied and deleted.

On the question of write-back, I naïvely thought that with ‘Keep a copy on my device’ I was asking OD to copy to the cloud and leave the existing file in place rather than move to the cloud then move back to a different location all lumped together by category on C:\..\OD

Good advice re: AV but McAfee blocks me from closing/blocking it using access permissions both as an app and a service. I can see a security argument for that.

Regards, Mikey63