Having trouble with folder permissions on Linux

I'm very new and I'm sorry if this is a stupid question, but is there any way to set folder (and future subfolder) permissions on Ubuntu?

I use the Arrs and new folders are made automatically when something completes, but I constantly have to use Plex to optimize my videos before they'll play. Unfortunately, the new folders get locked when they're made.

I'm not sure what I've done to my setup, but I'd love some help if anyone is willing.