As title says - I encountered a problem of skins upload,getting [skinname]: HTTP error : 0 : undefined when I try. I updated my browser,tried 3 different networks with 3 different service providers to rule out problem at my side and eventually other user from discord tried and had the same error.

Hello Eclipsed. What happened was that the website went silent for 1 or 2 hours. That's why you couldn't upload the skin. Also the mod cars could not be shown. But I think the website is already online

Actually the problems with skin upload occoured many hours before bigger website probelms. Also it seems like even if the skin upload page displayed the error,the skin was actually uploaded - it was loaded for other users in server.