Add a float property, expose to cinematics, hook it up on event tick to set the value of the property based on tick (just need to get it to modify the float value so that it can be recorded).
Add the BP to the level and to Take Recorder
PIE
Record
EXPECTED: The resulting recording should have a track for that float property
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There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-157575 in the post.