Create transition from the blend tree to your animation by right clicking and selecting 'make transition'.

Drag the animation you desire into an empty area in the animation layer.

Select the '+', select 'bool', and put the name you wish to toggle the animation.

Select the Parameter tab next to the Layers Tab in the Animator.

Inserting New Animation on Key Press and Hold You do this you can skip down to the last step below Add an expression parameter, append that to the animator controller, create animations and states, etc. You can place the walking forward animation in the same slot for walking backward as it will just play the animation in reverse. Creating toggles for avatars in VRChat was always pain. You will need Idle, Walking forward, right, left. Your avatar will appear in the 'Other' section of your VRChat Avatars menu. Ive also tried adding the custom locomotion layer into the models Animator, Action layer, Gesture Layer, and Additive layer. Ive tried setting the model I import the animations on as both humanoid and generic to no avail. To do this, click 'Build & Test' instead. For the animations I created, I animated the quadruped legs and left the humanoid armature in T-pose with no keyframes. You can also test your avatar without uploading it. You can also see your avatar in VRChat SDK > Show Control Panel > Content Manager.

Double Click on the blend tree and replace your walking animations in the inspector. After uploading your avatar, it should be available in VRChat.

Double-Click your renamed AvatarController and select the animation layer under the 'Layers' tab.

If the animation you have imported is an fbx, first you will need to make that fbx a 'humanoid' in the 'rig' tab then collapse it and extract the animation file using Ctrl-D.

In the asset folder make a duplicate of the 'SimpleAvatarController' found in to VRCSDK2>Sample Assets, rename it and move it to your avatar folder.

Make a folder for your avatar and include the animation files.First let's prepare a couple of things in Unity 5.6 Unity Inspector Settings for Key Hold & Press.5 Animator Inspector Settings for Key Hold Animation.4 Animator Inspector Settings for Key Press Animation.3 Inserting New Animation on Key Press and Hold.2 Replacing Standard Walking Animations.

Vrchat avatar with custom animations