you need to be able to set pictures for the thumbnails!
The only problem with YouTube creator studio is that people use Photoshop apps on mobile devices to create there thumbnails; and its a pain in the butt to and plug into your computer and then have like 50-50 of a chance of that the mail actually successfully setting itself. It wouldnt be much easier if you could just set your thumbnail through the app instead of half thing to do it on a computer. it would definitely benefit a lot of the mobile YouTube ors who only run off their phone.
sincerely
A fellow YouTuber
Mr. Sad
Kph fervid about
YouTube Studio