Unfortunately
Amazon is making a complete hash of this app. I cannot even access all my personal documents that was uploaded to Kindle for easy access. When I sent them an email all I got was this
"Hello,
I'm sorry you are unable to access your personal documents in your Kindle app for Windows 8.
The Kindle personal document service is not currently supported on other free Kindle Reading Applications for PC.
As of now, Kindle personal documents can be accessed only from Kindle devices and the following Kindle apps:
Kindle for Android
Kindle for iPad, iPhone and iPod touch.
This is the reason why you are unable to see all the documents and books that you have in the cloud in personal documents.
I have let the Kindle team know that you're interested in this feature.
We're regularly working on improvements to your Kindle experience.
Please feel free to forward further comments and suggestions about Kindle to
[email protected]. Each suggestion will be read and taken into consideration.
You can reach us via chat or freephone directly by clicking the Contact Us option at a time that best suit you in the right-hand column of our Kindle Support pages at ..."