How to Link an Existing Teams Channel to a SharePoint Site

Open Microsoft Teams, select the specific channel you want to link, and click the '+' (Add a tab) button located at the top of the channel window.

In the 'Add a tab' dialog box, search for and select either 'SharePoint' or 'Document Library' from the list of available applications.

Choose the option for 'Any SharePoint site' and paste the URL of your existing, unrelated SharePoint site into the field.

Select the specific document library you want to display within the channel, check or uncheck the option to post to the channel about this tab, and click 'Save'.

Open both the SharePoint document library and the SharePoint backend of your Teams channel. Create a unique, matching column named 'FileID' in both locations.

Log in to Power Automate and create a new automated cloud flow triggered by 'When a file is created or modified' in your source Teams folder.

Add actions to create or update the corresponding file in the target SharePoint site. Use the 'FileID' dynamic content to ensure the flow matches the correct files.

Create a secondary automated flow triggered by file deletion in the source folder, setting the action to delete the corresponding file in the destination SharePoint library based on the FileID.

Open your Teams channel, navigate to the 'Files' tab at the top, and click the 'Open in SharePoint' button to view the natively connected library.

Manually move or copy your documents from your independent, existing SharePoint site into this newly opened document library.

Once all documents are safely transferred and verified in the Team's native SharePoint site, inform your team members to use the new location and archive the old site.