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I'm vote number 200 for this. Please add this ability! We use Teams for many affinity groups at our company who gather for many events during the year and want to display our photos as a gallery. We find that you can't even open a file and browse from one to the next, which should be super basic functionality. Please add!
if you have an existing post that you want to show in a different channel, you can edit the message and cross-post. This will add the top-level post to the different channel, but will not include the full set of replies. We will keep this request in mind as we evolve the cross-posting feature in the future and update if the status changes.
Details on cross posting can be found here: https://support.office.com/article/cross-post-a-channel-conversation-in-teams-9c1252a3-67ef-498e-a7c1-dd7147b3d295.