Hi @stewart.bodzin,
Thanks. I think I know what is happening here.
If you are syncing an actively used pst file then it will be constantly changing. Each time the file changes, odrive will try to sync those changes up. Since the the file content keeps changing, odrive will abort the upload in progress, wait, then reattempt. Each time it is aborted it will leave the aborted xlarge folder around.
Leaving around the aborted xlarge upload is something we will need to address (I have spoken to the product team about this), however, it is strongly recommended that you so not sync actively used pst files. Since these are essentially database files, and change constantly, you end up having odrive continually trying to upload these files, which can waste a lot of processing power and bandwidth in the process.
More on that in this thread: