Settings - Transfers - Trackers
Individual Tracker Options
Allows you to specify options for any specific tracker within all transfers.
Multi-tracker announce mode
This controls how transfers with multiple tracker groups are announced. The original BitTorrent multi-tracker specification calls for stopping on the first working group, but some users may prefer to announce to all tracker groups at the same time. This is generally unnecessary because PEX peer exchange will provide access to the full swarm so long as at least one peer connection is made.
Allow UDP tracker connections
This setting allows connections to trackers that start with udp:
Announce event=paused to HTTP trackers when partial seeding (BEP-21
This setting when turned on announces to trackers 'event=paused', when you are seeding a partial torrent file.