This is a question that plagued me a while ago when my wireless router refused to work correctly with my Kindle Touch (3G edition).
I had a document that I wanted to transfer to my Kindle as well as my Kindle Library. Both of these tasks where easy enough to accomplish on their own:
- I connected my Kindle to my PC via USB and copied it to the appropriate directory on the device.
- I sent an email to my send-to-Kindle email address with the document as an attachment.
Unfortunately, when my Kindle would sync via 3G, I would end up with an extra "book" in my library - the document I sent to my library via email. Of course, the document wouldn't download since I wasn't connected via WiFi so I was left with a copy of the document on the device and another copy waiting to download.
Why couldn't my Kindle recognize that I already had the document on the device? Is there any way to add a document / book to your Kindle library and still have the Kindle recognize that it exists when manually copied to the device?