I love Sonarr and use it mostly with NZBget on a qnap NAS.
I use english subtitles on all shows if available.
Most subtitles fans know that many are out of sync due to the srt file not be the exact match to the media file.
Many but not all MKV have subtitles that mostly are in sync.
I personally remux all mkv to mp4 and extract the subtitles as SRT if it is in the container !
So all is good when i get the right mkv file.
I have tried tags picking amzn, NF etc but that only works for their shows.
Whoever it is that created that file I am asking to add something like SUBS or SRT in the Naming
Do the uploaders get some hidden buzz/award by their file being chosen the most?
If they added SRT or SUBS I am sure their numbers would increase!
For me I can then tag SUBS or SRT in Sonaar and have the best possible chance of getting synced subtitles!