Intermittent write issues with Plex DVR - Loos like Linux permissions

Hello,

I'm having intermittent Plex DVR write issues when recording TV, sometimes says no write access, I then go into Plex and de-attach recorded tv folder and re-attach, and works again for a little while, but others are are saying might be a plex / Linux permission issue (as never had this when running under WIndows VM). I'm not a wix with Linux, so using Krusader to help with moving files around, and wondering if I can use Krusader to create a user group for my recording TV folder for Plex to have correct Linux permissions... Any guidance on name and permission I should grant for specific tv recording folder please (I've added screen shot to help understand - any guidance appreciated

Cheers, Julian