Should I post the same content on every channel?
No, if each channel is read by different people or the format does not hold: a menu photo is not a Reel and an email is not a Story. The same source file is reused, with the crop and the line for that channel.
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Note where your guest actually is: Instagram, Google, WhatsApp or an email that gets opened. The miss is scheduling the same block on five networks and not replying on the only one that brings tables. You get one master piece and the versions that will really be published, not five automatic copies.