To monitor the file upload status, view the Upload Queue tab in Publish.
The Upload Queue shows information about all files that are pending upload or that failed to upload, including their status, who uploaded them and what their source location was.
The grid can be filtered and sorted by any field. If a file has failed to upload for any reason, the upload action can be retriggered by changing the File Status from Failed to Pending.
If the transfer is still unsuccessful, check the source location to ensure that the file is still available, has not been renamed, etc.
Note: After saving, release your reservations.