This is a really cool drawing, I love flight rising! The reason transparent isn't working is because your drawing exceeds the maximum file size (1280 x 1280) So furaffinity resizes it but when it does that it loses the transparency. To get it to work, you need to resize the drawing yourself before you upload it. If you don't know how to do that I can tell you how just let me know the program you're using. :)

aw thank you! I've not been on there long but i loooooove it :'D.

And thank you for explaining that! I didn't know FA resized files x). I'm used to deviantart as they rarely resize anything :'D