i know this is an old post but if i was still checking it for help then i’m sure someone else may find this helpful. i was also getting that idle error warning and what i did was rename the files i was trying to transfer.
Then instead of dragging and dropping all or one file at a time. I would select (or highlight) the clip one clip at a time, then click in the viewer window ” add clip to queue” and off it went. no more idle message.