How can I get files on my iPad into my Dropbox? Let's say I get a file in an email, or have it stored in GoodReader, or find a link to it on the web, and want to put it into my Dropbox using the ipad app. 

It seems like the only files you can add from the app are photos and video.  Am I missing anything?  Goodreader is a great example of how an app can "pull in" compatible files from emails, etc, but I can't find any similar capability in the Dropbox app.
I believe that whilst this capability is not included in the official dropbox app, it is possible to accomplish using GoodReader for iPad.


Open GoodReader on iPad and expand the section in the bottom right of the main screen which says "Connect to Servers"
Tap "Add"
Tap "Dropbox"
Enter your details and click add
Now tap the server you just added (I called it "Dropbox")
In the bottom right hand corner of the popover that just came up is a button saying upload. Tap it.
Select the files you want to upload and tap "Upload"


You will only need to do steps 5-7 the second time