Youtube channel art?

[The name master]

I've found out how to edit my YouTube channel. I'm trying to add channel art, but it keeps on saying that any image I upload is too small!

I want to make some channel art, but I don't know how!

[Petzbreeder]

The green image I use on my channel is 2560x1440, I read somewhere that 2560x1440 is the maximum size you can use. Not sure about anything smaller.

[The name master]

Thanks! I now got a pokeball channel art!