Amazfit Watch faces

[mention]SashaCX75[/mention]
Thanks for your answer, i added a transparent pixel and I got it working, but still the watchface doesn't work on my GTS, I think because of its weight, but I'm not sure

Hi to everyone, I'm getting the error "Bad Transparency Mask", I already tried almost anything to convert my images into a "good" PNG, I tried with FormatFactory, with Photoshop and other apps. I would like to know if someone knows the solution to this problem. Thanks