What happens when you link the epic games account to the xbox account?

So I want to start again with Fortnite but since I've been playing more xbox lately I've got used to the controller and now I want to link my epic games account to the xbox account because on the PC I just had a lot more skins and Before I link my account and, for example, all skins are gone, I wanted to ask whether all skins from both accounts are put together and then only exist on one account or whether all skins and other accessories are simply deleted.

Why should all skins be gone? That doesn't make any sense.

The skins are stored on the Epic Games account and as soon as you link the Xbox account, it accesses your Epic Games account via the Xbox.

So you have all your skins on every linked platform.

So the skins from the xbox and from the PC are on both platforms

Your skins are never saved on the Xbox, but always on the Epic Games account. You don't have 2 different accounts with skins but an Epic Games account with skins and the console that accesses this account.