When you click on the paperclip symbol, a list of accepted file types appears on the screen. the .pub format is not one of them. Using Publisher, you can use Save As to save the file in .doc or .docx format, both of which are acceptable. Alternatively, you can use a program like WinZip (if you have it) to create a .zip archive of the file.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]