Hey there, it looks like maybe you tried to upload a WebGL build but something must have gone wrong. You should try again! Make a new folder for the Build, give it a number. Choose the folder for your build. When it's done, take that entire folder, right click on it and choose Send To -> Compressed Folder. This will zip the file. Then try uploading that zipped folder again to Itch.io. Be sure to choose WebGL for the type of game, if I'm right that that was your goal. If something goes wrong, make another folder and try again! I hope you can get your game uploaded before the rating period ends so people have a chance to play to your submission! All the best.