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In just:play it is possible to add a Placeholder to the rundown, before the final video is ready. This is useful in case the scheduling has to be done, but the video is not available yet. Such a Placeholder can then be replaced automatically by as soon as the video once final video is available on the storage system. Make sure the playout storage is mounted correctly on the mac running just:connect, and that just:connect has Full Disk Access, like described here.