Uploading images through Photon doesn't work

When trying to upload any image it says:

Error: Failed to upload image: 
500: Internal Server Error

However uploading works fine in other clients, should I open an issue on the Photon repo, or is this a possible misconfiguration on this instance?

(sorry if I'm the only one that keeps removed on this community XD, I've actually been enjoying my stay, so thanks for all that you're doing!)