the only difference from your sonarr screenshot is that my API Path field is empty, try clearing that and see if it works. the Jackett based ones seem to work (for me) with just the URL
not really, you’d have to find a torrent that only contains the single video (what else ends up in there?)
i would expect sonarr will only pick out the main video file it wants anyway. its a waste of download but you have to download the whole thing, its just how torrents work.
edit: you can always go into your download client and open up the file list inside the torrent and disable the ones you dont want it to download (you can in transmission, presume others can as well).
obviously you need to be there to do that so it cant be done automatically.
you can also set a maximum size to download in sonarr if you dont want, for example, that 13gb torrent in your screenshot, in the hopes that a smaller one turns up. but if one doesnt you can always manually search and then disable the files you dont want
go to add series and enter tvdb:362869, that should be the “show” you want. searching on formula 1 doesnt really give the right results
if thats not the right one, try this link https://www.thetvdb.com/search?q=formula+1&l=en and find the correct ID and add that instead