Oso. We can't see your shot. Try renaming it to untitled33.
JPG in the path.
Here's a couple of tips which might help.
1. Before uploading an image save or rename it with a unique file name. osopic33.jpg would be much better than untitled33.jpg.
2. I don't know which editor you use to save shots. Some image editors seem to save files with the extension in upper case. To get the exact file name, right-click on its icon on your HD & select Properties. The exact file name including the extension will show up in the window. Copy/paste this into the path in the topic. (The exact file name should also display in the Upload box when you select it.)
3. Before posting a topic including an image check it out by clicking the Preview button.