I have VIP status, it always worked perfectly, but now it doesn’t appear. I tried PNG and JPG
VIP status only makes it so that your playmat that appears shows to your opponent.
If the playmat is not showing when you place the file in, chances are the file type and/or compression is causing issues with it.
Try a different version of the image, sourced from somewhere else, or try converting it with a different software to JPG to see if the compression settings are different.
To my understanding, JPG is the only current supported file format. JPEG isn’t even supported.