Error importing a skin, problem with the size

When I wanted to use personal skins, I tried to upload one, but the game sends me the message that it has to be of said size 64x64 or 128x128 and so on.

 

And the photo I upload is 64x64, I even used a old skin than i used in the past with my old phone, But it doesn't work either, I hope can help me because it is annoying to have to limit myself to using only Minecraft skins.

In the photos I will put one of what Minecraft sends me and also another of the description of the photo that I wanted to upload where it says the resolution and size

good day.