Hi everyone, hope that i can find answers to my questions in this forum

I just bought a Egreat A10 mediaplayer, along with a 4tb Seagate Ironwolf Sata-hdd
Ive partitioned it with GPT and formated NTFS - i did this using a usb-connected cabinet with the sata-hdd inside
(ive heard that this might be a problem and that you should connect it straight thru SATA instead?)
well.. when i start the mediaplayer up, i can access my movies, by viewing them in a "file-list",
and i can also play them this way..
But i cant add a source to scrape from, so i cant see all my movies on the "wall-thing" with a more fancy layout!
When i try to add source, i can almost only find a lot of network-options,
but also the two folloing: EXTERNAL STORAGE (but this seem to be something about an sd-card?)
and ROOT FILESYSTEM..
but what should i do to be able to see the internal harddrive that ive put in the mediaplayer?
//Hugo