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128x128 hd skin

So I noticed you guys have 128x128 skins. When I go to upload a 128x128 skin, it turns it into a 64x64 skin. What button do I click to make is HD? I play minecraft mostly on my computer, but I made my skin on my phone because it was just easier that way. Also I’m not sure if my mom will just let me download the app on the computer. So, how do I upload my 128x128 skin?