You did it once at least, Bernie! The file name you selected appears in your post above, but the link isn't complete. That usually happens when you forget to click "Done Adding Files".
Try it again. It worked before! All you have to do is complete the correct sequence.
Click on "File Manager". The file manager screen appears.
Click "Browse" and the browser screen appears. Find your file.
Click on (or double click on, if needed) the file you want to load. The browser screen disappears and the file you selected now appears in the file manager's window.
Click on "Add File". Important: wait for the filename to move to above the window indicating the file was uploaded!
Click on "Done Adding Files" to complete the process, and the file manager disappears so you can complete your posting.