It give me an error when i try to change skin whit the URL and whit the pathway in my pc.
The url and the pathway are rigth.

Im using the replay mod whit fabric API

file:///C:/Users/mikes/OneDrive/Desktop/Video_photo/Skin/red.png

This is your local file, not URL?

You should only use C:/Users/mikes/OneDrive/Desktop/Video_photo/Skin/red.png in path, e.g. /skin set upload C:/Users/mikes/OneDrive/Desktop/Video_photo/Skin/red.png without the file:///

Edit: you can read more about command usage on wiki

ok, now i try it, thanks!

ok it work, thanks

Could you provide a skin url which gives you an error? Thanks.