The ISN has a great feature located under Tools -- My Files and Folders that allows you to upload documents to your ISN that need to be accessed on a regular basis. Further, the documents uploaded to My Files and Folders can also be attached to an email template, for those regular emails that are sent and need static attachments.

Once you are on the My Files and Folders page, navigate to the folder the document is to be added. Hover you mouse over the folder and the option to add file will appear:

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