Once a .mcpack or .mcworld imports successfully, Minecraft places them into the menu that matches their type.
Worlds (.mcworld)
After import:
Play → Worlds
Texture Packs & Resource Packs (.mcpack)
After import:
Settings → Global Resources → My Packs
To enable them in a world:
Edit an existing world or create new
Go to Resource Packs or Behavior Packs
Activate the pack
Skins
After import:
Dressing Room → Classic Skin
Persona Items
Dressing Room → Character
If content doesn’t appear
Restart Minecraft
Ensure import completed successfully
Check that you’re logged into the correct Microsoft account