Unable to access my own documents. Says I'm not the "owner"
I have had this a couple of times and I see it now as potentially very upsetting in the future when I come to work on documents I have created in the past. Trying to access some documents saved to the cloud, but when I try to open I get this:

I MUST have access because I created it myself. I am the only person who uses this account and am definitely the owner. I am scared now that everything I've ever done and saved to the cloud will be lost to me. Can someone tell me how to fix this "break" in the path to my documents?
Many thanks!
