 So you don't know how to import your face animations into Blender, not a problem. Most efficient facial mocap software exports your recordings as an FBX. So if you're in Rococo, you just right click, export, include face data and pick a location on your computer. Once you have the FBX, what you're supposed to do is open the file with your character, import your new FBX head and go to the timeline, copy all the keyframes and paste them onto your character. That's supposed to be how it works. But usually when you try that it'll give you this error message. And after spending hours of wasted time, I have found a solution. It's a pretty stupid and jank solution, but so far it's the best one I've found. So here it is. What you have to do is set the timeline to zero and then go to each shape key and press I to key frame. Do that with every single shape key and then Blender will finally let you copy the frames from your export onto your character. You're done. Another option you can do is you can try and join these two meshes together so that they share shape keys, but whatever method you choose those are the ones I've found. If anyone has a better solution I'd love to hear it down in the comments, but otherwise it's very unfortunate that Blender still hasn't fixed these kind of basic animation issues. But anyway, hope that helps and as always I hope you have a fantastic day and I'll see you around.