in doubt, use logfox or adb logcat to look at eDrive messages.
the bookkeeping avoids re-uploads and holds onto “etags” of remote files if they’re more current and need downloading. If the remote (“cloud”) is mostly empty or you have solid backups, a reset of storage is easy. cache should be inconsequential.
I’m cautious because not every error mode can be anticipated - like an unwelcome overwrite on either side.