Bedrock Classic Skins (PC)

When trying to upload a classic skin, I kept getting an error message telling me to make sure the image was a .PNG file and was one of the accepted resolutions. Despite being both, it refused to let me use it until I tried uploading the skin from my laptops files instead of transferring it from my phone. I think that in the error message, that bit of info should be included so people know to download the image from their phones to their computer first, then select it from there.