If you see the message Too many files uploaded, your uploads have been throttled for short period, this is due to a security precaution in the editor that kicks in after a large number of uploads have been processed. The reason for this is that too many uploads can potentially cause performance issues for other users. The limits can be dynamic but are roughly 200 files over a 30 minute period. Waiting for 30 minutes before uploading more documents will refresh the throttle.