Latest questions about "output file"

I can produce the alpha stair .sda design but when I transfer to Alphcam the parts, it can run, but no nc output is produced to transfer to CNC machine.

I'm trying to convert an MP3 song in Voxal voice changer, but every time I select a song the program wants me to select another file (an output file) and I don't know where I can get it.