This is my first frontend mentor challenge.

The preview isn't showing your work. I had a similar issue when I did my first challenge. On Github I originally clicked the link to import all the files, but for some reason, it wouldn't select the folders, so they weren't uploaded and I ended up with a similar message you have. I deleted and reuploaded everything, but the second time I just selected everything in my folder and drag/dropped them into Github and that seemed to work. Hope that helps. Good luck!