Tabs let you highlight the apps, services, and files your team cares about right at the top of a channel, so everyone in your team can get to them.
Every channel comes with three tabs by default:
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Conversations - where your team posts messages and replies, holds meetings, and shares files.
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Files - helps your team store, find, and co-edit all the documents that have been uploaded to that channel.
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Wiki - use to draft documents, track meeting notes, and collaborate in real time.
Add a tab
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Select the plus sign next to the tabs.
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Select the type of tab you want.
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Type a name and choose a workspace.
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Select Post to the channel about this tab.
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Select Save.
Get a link to a tab
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Select More options, the three dots in the upper right.
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Select Copy link to tab.
Start a conversation about a particular app or file
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Select Show tab conversation.
People can follow the conversation here, or back in the channel. Select Conversations to see the conversation in the channel.
Source: Microsoft