Originally Posted by nickredding
Assuming you are sending it via email@example.com
it shows up in the Documents tab. If it's in an email as an attachment which you are trying to open that may be why you are having that problem.
Yes I was emailing as an attachment. It was a news feed from Calibre. When I would email it to firstname.lastname@example.org
Amazon treats it as a document and the formating wasn't what I wanted. I tried emailing it as epub and it opened ok in Mantano. I thought I would be able to send a mobi file and the kindle app would be able to open it.