8 week old kitten crying in the litter tray

[Eyes Half Closed]

He is also a very vocal kitten constant crying whrn he's not getting attention, he is also eating and drinking fine, he also doesn't seem like he's in any pain and he's not peeing or pooping outside the litter box.

[Eyes Half Closed]

Hey I recently adopted a 8 week old Maine coon X sphynx kitten named Remus, I've only had him one night and for some reason he 1. Can't find the litter tray and 2. He cries when he's in their both wee and poop, I'm worried if it's a UTI as I've recently lost a cat to urinary crystal, is this just kitten behaviour or is it something to worry about?