This setting does not apply to manually selected files.
The category becomes a sub-folder in your main download path.
Set the priority for this torrent where 1 is the highest. When empty it will be assigned the lowest priority.
When a single download fails it will retry it this many times before marking it as failed.
When a single download has failed multiple times (see setting above) or when the torrent itself received an error it will retry the full torrent this many times before marking it failed.
These files are available for immediate download from Real-Debrid.
It is possible that there are more files in the torrent, which are not shown here.