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I'm quite new to animation and I'm going to make my first walk cycle. I started by importing a character I got from sketchfab and it doesn't have any rig layers, but the button is greyed out. How come? Do I have to create my own armature?
This is Mixamo Rig. To get the generate rig option active, you need to use Blender's own Rig called Rigify. From Edit go to Preference and from Addon you can active Rigify.