Its by design. These functions can only be controlled from the player screen.
To transfer files from your camera roll to the library, tap on the iPhone menu in the app, select photos and longpress on any file you want to trasnfer and then select download. The file will appear in your library. You can also select multiple files and copy them to your library using the select option.
Thanks for your message. This is not a pro feature. If you're on the iPad, from the library menu you can rotate your device into landscape mode to view photos in full screen, this however is not available on iPhone & iPod devices. For these devices full screen is only available in the player. Hope this helps.
Sorry for the inconvenience, you can get the free upgrade again through an offer in the app that asks you to review the app in return for the free pro version.