A useful sample should include coordinate-frame definition, units, timestamp interpretation, invalid-value convention, sensor pose and a short description of the scene. Keep the clip short and include the expected observation.
Suggested format for a small point-cloud sample
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Add at least one known dimension or reference target if the question concerns accuracy. Otherwise reviewers cannot separate scale or transform errors from sensor behavior.
Include the configuration used to create the sample, but remove credentials and site identifiers. A checksum helps confirm that everyone is reviewing the same file.