@sculptor310
if I understand your question correctly, you want to be able to put files somewhere and later be able to send those files as attachments via email sent from your iPad or iPhone, is that correct?
if so, either (or both) Dropbox and Goodreader will let you do that.
e.g. store your file(attachment) in your Dropbox, then you can upload it to your iPad or iPhone, then click the "Email Link" button to generate an email from within the iOS Dropbox app. this will create an email with a URL link to that file in your Dropbox.
if you use Goodreader, you can store the document locally on your iOS device within Goodreader (you can first upload the doc to Goodreader via Dropbox, iDisk, or directly from the internet via URL) - then when you click "Email File" in Goodreader it creates an email containing the actual doc attachment.