Decodificando el identificador "upload://" a url

[RGJ (Richard - Communiteq)]

Difícil de encontrar, efectivamente, pero aquí tienes.

Converting short upload URLs to full URLs

First base62 decode using the inverted character set, then hex encode the result. In Python code it looks like this: rebase = hex(base62.decode(base, base62.CHARSET_INVERTED))[2:].zfill(40)