Can't choose custom profile picture?

[BenTheMiner]

I want to add my icon as my profile picture for BVEStation but when I try to upload a PNG image from my computer, it outputs "The attachments upload directory is not writable. Your attachment or avatar cannot be saved.". When I try to set my profile picture via a URL for the image, it sets it to no avatar. I don't know if I lack the perms to do so or if it is an error, whether on client side or forum side.

[F train fan]

I wanted to see if a dev would reply before me but W/E, try resizing the image and see then if it allows you if not try converting it to JPG if that doesn't work just reply back