I have windows 11 too. This post has a photo attached. After typing your post scroll down to 'Attach' and click on 'choose file'. Then select (double-click) the file from your computer's normal file directory. The file name should appear alongside the 'Choose file' button below. Click 'Post' and your post is done.... unless your attached file is too big, when the Forum software will kick it out! To reduce file sizes, I load a photo into 'paint', a standard microsoft app, then use the resize button, then save as a new file, or cut and paste the part of the photo you want to focus on and save the clipped image as a new file. Hope this helps.