Why isn't my animation for walking playing?

Hi! I’m following a 3rd person controller tutorial series (Link to related tutorial: 3RD PERSON CONTROLLER in Unity - Movement Animation - YouTube) and was setting up the animations for walking and running (I’m using a blend tree), and they only play the first couple frames when I move, but it works properly for the guy in the tutorial. The idle animation works just fine, but walking and running don’t work right! If anyone could help, that would be great. Thanks!

Check your animator. Maybe you fall back to idle animation as soon as one instance of walking animation finishes.