Custom sleeves arn’t updating on my game regardless of being a donator and having the correct names and being in the correct location.
Thank you for making a bug report.
Since you have nailed down all the other factors. The next question is what format are the images you’re using sleeves?
I believe only .jpg files are supported as sleeves.
If you can try using this image and placing it in your sleeves folder, this should work.
If it does work, I’d imagine that it is the file extension that is the issue.
Please feel free to let me know here, or in the Duelist Unite Discord channel for #omega_support we would be happy to help.