1. Get a user to share an emoji/sticker pedastle or directly to you
  2. Go into your inventory or add the image to your custom radial menu emoji/sticker section
You should now see the sticker / emoji has appeared as a white rectangle that perfectly shows when used or placed.
There is a current work around for this,
  1. Go into your inventory and click on the sticker/emoji and click edit
  2. Keep pressing the next button and then finally save
You should see that the emoji/sticker is now correctly showing, You will have to replace this back in the radial slot you wanted.