Henry’s video on the browser-only VPN workflow opened my eyes to how I could use split tunnelling on the Mullvad android app. I always kinda knew split tunnelling was a possibility but never considered using it practically until now, kinda embarrassing 
When YouTube would get fussy since I’m using a VPN I used to just disable it entirely, then go do something else and forget I left VPN off.
Now I just have split tunneling configured so GrayJay and my messaging apps don’t go through the VPN, I get smooth YouTube watching and video calling without needing to toggle the VPN on and off, cheers for that one!