Maybe this will help -
1/ Hit post reply and wait for the edit screen
to come up
2/ Hit the paperclip icon at the top of the compose window and the attach window will pop up
3/ Using the top set of name fields - select browse. Locate your file and hit the upload button - don't forget to hit the upload button
4/ There will be a short wait while the file uploads then you will see the filename right below the set of name boxes
5/ Then scroll all the way down and select - close this window
Don't use the second set of name boxes. This is used to "link" to a file located on the internet
. The file needs to already be loaded on a server somewhere that everyone who clicks on it can get to.
Let us know how it works out.