avatar trouble

hi, i'm having trouble using a gif as an avatar. i've cropped it as much as i can, but i keep getting told that it's too big for use. is it due to how long the gif is, or is it an error? i don't know where to look for the kB size or how to reduce that.

these are the ones i've used:

i'd appreciate any help!

yea that does work! and good to know! i'll use that in the future :-) thank you!

ah, okay! thanks for letting me know, that makes sense! and i'll make sure to try that too :-)