Can I use Epic-owned assets or cosmetics in my thumbnails or as a character in my creative island?

Epic owns intellectual property (IP) rights in all of its original creations. You may only use Epic-owned assets made available to you in UEFN in your island or thumbnail. 

You may not use recreated or otherwise obtained assets, maps, characters, music etc., from Fortnite or other Epic-owned properties without permission, either in your island or its metadata. For example, you may not recreate Battle Royale season assets in your island or metadata if they are not made available in UEFN.

For more information, see the Respect IP Ownership section of the Fortnite Developer Rules (Opens in a new tab).