Okay. I tried all my browsers (Chrome, Edge, Firefox) and had problems (maybe my web shield AV), But THEN... SUCCESS. First, open iexplore.exe to get old school. Now navigate to the site and login. When you click build, you should now see boxes. When you post a picture, click select, choose your file, and immediately look near bottom of the entire web page for the SAVE button, click it. I know you think the select and upload didn't work, it seems to only 'upload' after you scroll down, click save and refresh to see the pic show up. The photo editor isn't required, and seems to prefer PNG over JPG.