The phone manufacturers all have their own bits and bobs on top of Android. You should be able to see more of the files by connecting your phone to a PC via a USB cable.
How did you get your test project onto the phone? Using Companion?
If you connect the phone to your PC with a USB cable, you can save the APK file on your PC, then drag-drop it into a folder on the phones "virtual" SD card (Android phones usually have an area of memory labelled SD - not to be confused with a physical SD card plugged into the slot). On my phone, there is a very convenient folder named "downloads". Once on the phone, you can double click the APK (with your mouse on the PC) and the App should install.
Normally, you cannot see the files of an installed App. Each App has it's own private area on the phone, a basic security measure by Google. Of course there are Android apps/PC apps out in the wild that can explore more, but you shouldn't need to.
The phone Storage Meter is Red? That sounds like an Alcatel thing - perhaps it means that you cannot install another app? Perhaps try uninstalling apps you hardly ever use? Perhaps moving media files (photos, music etc) from the phone to the microSD card will help free-up memory?