Custom skin don't work on MCPE

Recently I uploaded a new custom skin to my photos and I wanted to use it with Minecraft, so I opened the game and tried to change my skin. When I clicked on it the buttons for choosing the format (slim or classic), the buttons were blank and I couldn't change my skin. I already had a custom skin I used before that and I tried it. Everything happened normally and I changed my skin. I have been trying to use the new skin every day, but it still was blank every time. In the photo below I zoomed in on the skin I was trying to change into, but I couldn't capture the actual footage of it happening.