I can only start 1 of my 5 animations I have several animations for this model that I was able to access previously in the action editor, but now I can only access my walking animation. Can anyone tell me why and how I can access my other animations again?
You have to select your armature:


Press Alt+H to make your armature visible, and select it
In the Dopesheet window, stay in Action Editor mode
In the dropdown menu, select the animation you want