StarterCharacter Animations NOT Working?

Hello, hope you all are doing well.

Issues: I have been experiencing some issues with my custom character that I want to use. The issues I am experiencing are the animations not working for my StarterCharacter.

What I want to achieve: The thing in which I want to achieve is a custom starter character to (skinned mesh character), to play animations when walking, jumping, idle, swimming, falling, etc.

Further Details: Here is a video that shows the issues that are occurring. In this video I go over what the character is built out of, and do further explanation.

Video: StarterCharacter Video