yes it's possible! just tested it on my cbox. i uploaded an emote using a the img url. have u tried a different browser maybe? (also i really thought u had to have a paid account for custom emotes, so this is great thanks for bringing it up hehe)
just came across your site on the global activity page and omg you took me backkk with that layout and your piczo shrine! it makes me so happy to see you have ongoing projects collecting these 00s websites, back when blending and tight letter spacing and line height and ;;; *** was a thing, LOL. LOVE IT
Thank you!