Are you able to email me a screenshot of the config window and maybe your aseprite file as well? I would also love to know the GM IDE/runtime version you're using. prote1337@gmail.com
Issue resolved! My GameMaker didn't completely rename my project which caused issues with GMLink. Fixed by editing my .yyp with notepad and replacing all instances of my old project name.
App is fantastic . Appreciate the dev for providing prompt support.