A. 1. Ensure that the skin is saved correctly in Skinseed. Go to the skin's settings and confirm that it is properly exported. 2. Check that you are using the correct version of Minecraft that supports custom skins. Some versions may have restrictions.
B. 3. If the skin still does not load, try re-exporting it from Skinseed and then re-importing it into Minecraft. Sometimes, a fresh export can resolve loading issues.