PatFett,
After you hit the "Upload" button in the "Manage Attachments" window you need to wait for the upload process to finish and the window will change to confirm that the process is complete. Depending on the size of the file(s) and the speed of your internet connection, this could take seconds or quite a few minutes. Then you can close that window and submit your thread. You'll also see the name of your attachment(s) are showing up in the original window so you can confirm that they have been uploaded before you hit "Submit".
I hope this helps.
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