The images I'm using don't have black borders but in the storyboard, there are thin black outlines, how do I get rid of those?

Video showcasing problem: https://drive.google.com/file/d/1RzWs6T3CrR_cRmXds-Q3bRT1sLMD6qgZ/view?usp=sharing

Assets used: https://drive.google.com/drive/folders/1XfpfQOAxGIFf9vlRZ2b5s-DKYJn0yqdh?usp=sharing

(I'm using osu!Stable)

this https://github.com/Corecii/Transparent-Pixel-Fix/blob/master/REE.md
more specifically pixelfix-win-x64.exe or pixelfix-win-x86.exe

When you see an unintended black outline just drag your images into the file and it will fix it for you.

Once you corrected every file, reload in the editor and it should be fixed

Thank you so much, this worked perfectly!