so how do i import my custom skin into minecraft?? its not working for SOME reason

i have been dealing with this problem lately, I just recently got minecraft and when I tried to import my custom skin or any other skin in general, it always says "Please import a png file of dimensions 64x64, 64x32, or 128x128" the issue was that the skin I was importing was the right size, hell i even checked my file size and it was the exact same thing.

I adjusted it to ALL three sizes but none of them work for some reason, any ideas???