I am trying to migrate from google storage to self hosted. I was able to get the server set up - correctly, I think. I can log in, added a new user, and connected that user to my android app. I can see the server in my app, and have attempted to import entries from my google account, but I'm getting an error with code "JSH-B0903" when I try to sync. I don't see any errors on the server when this error occurs, bu t in the client logs it appears to be something with saving media. Any insight as to what this error means?