Uploading custom skin error

Hello Mojang/Minecraft,

I have noticed since the 1.11 update that I am having issues uploading my own custom skin to Minecraft. I want to obviously state that before the 1.11+ update, my uploading custom MC skin has been that of no issue. The error I get when choosing my own skin is it isn't compatible across all platforms (aka Bedrock). I get that on any custom skin I get regarding if its from [ Skindex, NovaSkin, nameMC, etc ] .

I would wondering is this is an issue on my side and wondering if a reinstall would do it, or if its on your side. If the issue is on your side, are there ways I can fix this, such as run my skin file through a program to which then will make it accessible to be used across platforms.
Many thanks

• James

Explanations and step to explain my issues

[ Image 1 ] -> I open Minecraft and the skin presented is the one that was loaded upon opening the application

[ Image 2 ] -> Opened my skins settings which shows the default MC skin with the "Available on any Bedrock Platform"

[ Image 3 ] -> When I change my skin to my custom one .Only available on specific platforms

[ Image 4 ] -> The Skin has been set and existed out of the skin settings

[ Image 5 ] -> Then after I did the following, I restarted the Minecraft application and thusly bring me back to [Image 1].