How do I make my animations work on the roblox website and not just studio?

i have a custom character names StarterPlayer in StarterPlayer I now spawn as that character in studio! The animations I have made for it are working to! I changed the animation number in the animations things in the script (The child of the child if the parent is the animation script) I have also changed the ID numbers of the animations within the script! I join the game on the official ROBLOX website! I spawn correctly however my animations go back to default! My Custom Character Appearence is a R15 rig! How do I make the animations work on the website? If you know how to make custom animations without using a custom character appearence please list information on how to do that!