I created a 128 x 128 skin and tried using it but it just didn't work.

1) I tried using it in my WINDOWS 11 using bluestacks to play MCPE but the skin pack came glitched.

2) Then i used it on my android SAMSUNG A12 (android 12) and got the same result. 

3) The i used it on my VIVO Y20A and it didn't work this time either.

4) I thought the problem is in the skin pack so i tried using it directly through choose custom skin but it says "That's not a Minecraft skin, silly". 

5) Then i removed all parts which had opacity less that 100% considering it to be the problem and used it as a skin pack and a direct skin but still can't fix it.

6) I used both apk and premium version of minecraft but problem remains unsolved.

The problem can be reproduced using attached skins and skin files. 

Other details: 

1) skins created using blockbench

2) skins are yet to be completed i was using them to see if they work or not, i mean 128 x 128 skins