What setting will allow me to rip a blu-ray surround sound (using imElfin Blu-ray Ripper). I.e. 5.1 channels or 6 channels?

I have been getting sick of YouTube and I decided to split my youtube channel into 4 other channels. Now I am enjoying making these youtube channels. But I can't understand the customized thumbnails, which bothers me a lot!!!
On my old channel, I had customized thumbnails. But on my new youtube channels, I dont have them. I emailed youtube to ask why I just get jibber jabber that I cant understand back!
What can i do now?