The mailmerge process envisaged in the link entails two mailmerges:
• a directory merge from your Access DB
• an email merge from the Word file generated by the directory merge.
I don't know what your Attachment1 & Attachment2 have in them, but they can't be connected to your Access DB when they are merged. It sounds rather like you need to generate the merges of these two documents, then split them into individual letters that the directory merge's table references so that the email merge can find and attach them.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]