If you set a logo on an organization or network, and the logo is a PNG, you get an error that just says "Not Allowed"

The Help icon / question mark just says it should be <50kb, it doesn't specify file type.

JPG upload appears to be supported, but that of course doesn't support transparent backgrounds.

When trying .gif it's more clear that .gif specifically isn't allowed:

So it seems that .png isn't supported for some reason, but it's unclear why - perhaps a technical issue. An easy fix could be:

• In the help, specify what file types are allowed
• update the error message for .png to be more like the one for .gif

Even better - add support for .png for transparent backgrounds.