Sync file libraries to SharePoint in Microsoft Teams
Each team has a corresponding SharePoint site. Changes made to files in SharePoint automatically sync to Teams (and vice versa), but if you want to make sure you have the very latest version of a file, you can manually sync the file libraries.
Synching in a channel
At the top of your channel, select Files > Sync. The sync will take a moment, but will ensure that your Teams team and the associated SharePoint site are up-to-date.
Likewise, you can select Sync in SharePoint to make sure you have any updates from Teams.Reverting a deleted, renamed, or unsynched folder
If the SharePoint folder associated with the channel was deleted, renamed, or hasn't been synced you can revert a renamed folder or sync a folder following these steps:
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Go to the channel, and select Files > More actions > Open in SharePoint.
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In the upper-right corner of your screen, select Open the details pane > More details.
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Under Activity, locate the original folder name, and then rename the folder using the original name.
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To sync a folder, go to the channel's Files tab. Select Sync.