Only first sound appears after installing sfz sound font

I'm new to Musescore and sound fonts, so bear with me.

From looking around, it appears to me that an sfz sound font, is a text file containing playback definitions for each sound, accompanied by a corresponding series of sound files in .wav format. So am I right in thinking that when the Musescore instructions refer to adding an sfz sound font, I need to add a folder containing the sfz file and the accompanying sound files?

Also, if I put a soundfont into the user soundfonts folder, I cannot access the soundfont from the Fluid tab, but I can from the Zerberus tab in the synthesizer. Is this correct?

Also, although the sound font has many different sounds, when I access it from the mixer, I only see the name of the sound font, not any of the individual sounds. If I add this in the mixer, I appear to get only the first sound in the soundfont file.