In the pic below notice that Position isn't an option to add under Transform. That's because I already added it. But as you can see the property isn't showing up. This clip is part of a Playable Timeline: This GameObject is a skinned, rigged, and PSDImporter-based with IK added: (All done in Unity) It doesn't matter which property I try to add with Add Property, none of them show up. This bug paired with the general UX issues within this feature stack has been extremely frustrating. Edit: Just updated to Unity 2022.2.21f to make sure this wasn't fixed in the latest build of the editor. The issue still persists.