Hi,
Many of these look like cache files (browser cache). Do you have any applications or application data within the odrive sync scope. This could possibly happen if you’ve performed a “sync to odrive” on your user home folder, or something similar. It could also happen if you are running applications out of the odrive folder.
As for disabling the notifications, there isn’t a built-in way to do this other than enabling auto-trash and setting to “immediately”.
You can check out this post for some potential workarounds. In Windows case the notifications will be re-enabled on restart, unfortunately: