You cannot create or add custom skins in Apex Legends through official, supported tools
Apex Legends does not provide a public skin editor or modding system for custom cosmetic creation
Custom skins made through third-party mods are not allowed in online play and can violate the game’s terms of service
Using unauthorized mods or texture swaps can risk account penalties, including bans
If you want unique looks, use the in-game Legend skins, weapon skins, charms, banners, and recolors available through the store, events, battle pass, and crafting system
Check official Apex Legends updates for new cosmetics, limited-time event skins, and store rotations
For personal art or concept work, create skin mockups in external design software instead of applying them in-game