Choose the skin does not work on Chromebooks.

When I tried to choose a skin, I receive an error message "Please import a .png file of dimensions 64x64, 64x32, or 128x128". 

1. Open Minecraft
2. Go to dressing room
3. Create Skin
4. Classic Skin
5. Import skin and Choose the skin
6. Use a skin like 64x64, or 64x32, or, 128x128
7. And you receive the error popup message