I dont really understand Point 3 and 4 of the Submission Checklist. What must i do exactly to upload my Pixel Art Image? Do I have to paste my image over the Pixel Art Jam Cover Image and what is screenshot supposed to mean? I mean, we already upload the original and one upscaled version. (I for my part use Aseprite and Export the image in 100% for download and in 1000% for cover Image. At least thats how I understood it.)

You need to upload a 160 x 144 pixel image as the project's downloadable. You also need to upscale the image and upload the upscaled image as the project's cover image and as a project screenshot. You can overlay the jam banner on the cover image, but it's not required.