create the sequence, make animation… then in the content browser right click on the “control rig sequence”, at top should be the export option, if this doesn’t show up not sure???
next screen should open and then you have convert control rig, at this stage it looks like the animation sequence can only use existing animations, the create new animation sequence doesn’t work., just duplicate an existing one, it will overwrite it, so be careful.
The whole process is a bit janky, seems to not work at times, saving seems to clear it.