hi, brand new to this, borrowing my uncles Dup 4 before i buy my own.

I cannot get this thing to print via USB at all using Wanhao Cura… I cannot get it to read a microsd, when it reads a regular sd card it cannot see an STL file or any other type of file that would suggest a print. It only finds Folders, even brand new ones I make to see if the card was the issue… any help appreciated