Alternatively, you can upload the skin directly on the Official Minecraft Website by logging into your profile and following the upload instructions. How to Change Skin in Bedrock Edition
: Give your skin a name and select your preferred player model (Classic/Wide or Slim/Alex).
: Click Browse , locate your downloaded PNG file, and select it.
: Open the Classic Skins tab (usually the hanger icon or three-character icon).
: Click Save & Use to apply the skin immediately.
: Visit a site like The Skindex or NameMC and download a skin as a PNG file.