Do Overlays Not Work on Raspberry Pi Devices?

I have a few Handheld boards that i use for RA on my main PC, i copied these over to my Raspberry Pi device but when i loaded them up i just get slightly darker screen, if i changed the Opacity the screen gets darker or lighter and if i change the shrink the scale i just get a 16:9 darker (depending on the Opacity ive set) square scaling smaller on the screen. Any ideas why the actual overlay doesnt show and just a black 16:9 rectangle?

No one use a RPi device on here??

I haven’t heard of this happening before, but I’ll try to ask around.

Ok thanks.