As far as cloud apps go the features of this app isnt up to the competition. First there is no extension for the sharing button in iOS like other cloud apps. You have to go to the app & upload it, too many steps. This is something I use a lot, having to download to my photos, open the app select the pic/video then upload.... Too many steps in iOS today, for older versions of iOS where there was no extensions, fine. Also would like to see the ability to use Touch ID like Dropbox to protect the files, even a passcode at minimum.
For a forward thinking company like Amazon I find this app pretty behind the times in comparison to other Cloud Apps out there. Will continue to use it, not sure if its worth paying even a nominal fee.
As far as other features same as the other Cloud apps.
Hope Amazon starts to add these missing features.
Jdemelo about Amazon Drive, v1.5.0