The material you have circled is the 1e_Gold tail Long mat, that is for the tail of the hivewire horse, The figure you have circled is the unicorn tail. That is the wrong mat for that figure, you need to use the 1f_Gold Uni Tail material for that. Also these are material collection files (Mc6) they do not add figures, they only change the materials (textures,etc) of the figure you have selected.

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Consider me insane if you wish, but is your reality any better?