My skin is not working propertly in the server.

I've bought the game itself, but my friends haven't, so we have to enable cracked versions. I uploaded a custom skin to my game, but when I log in to the server I have Steve skin. My skin shows well in a single player world, I only have this problem in the Aternos server.

We are playing in 1.13.2 if it's matters.

I hope someone can help me with this problem.

Quote from Roman

Install the skinrestorer plugin

Thank you for your answer. I'll try the plugin.