There are a couple of different ways for you to load a document into the LetterStream website for use in the future. The first way is to simply log in, click on "My Account" and choose "Remembered Items". This section allows you to load new artwork as well as modify or delete existing "remembered items".
You can load documents, logos and envelopes for later use.
Another way to save documents for later use is in the job creation process. There are various places where you can save the artwork for future use.
After you have a saved your document in Remembered Items, it will be available for any future mailing without the need to reload it. Just look for the "Use Saved Insert" option on the "Inserts Review" screen while building your mailing.