The FASO image uploader now allows you to upload .png files. 

We still recommend .jpg files, especially for artwork images.  And, if you upload a .png file, we will convert it to a .jpg (thus, we do not support transparent .pngs - or, more correctly, the transparency will be lost in the conversion to .jpg).

But for convenience, we now allow you to upload .png files without converting them before-hand yourself.