How do I apply Custom Animation to a mesh that is morphable

Ok so im creating an GUI morph and im using custom models/meshs (the models are stored in the replicated storage) and I dont know how I can apply custom animations to them, for example a walk animation or standing animation. I already tried some tutorials but its always like “put them into startercharacter” which im not using and even if I try it it doesnt work. I would really appreciate a step by step tutorial.