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Firstly, open your Microsoft Teams app, then go to your Teams channel where you wish to access the files from.
Select the "Files" tab and click on the "3 dots" (more options) button in the toolbar to select "Open in SharePoint" option.
Once the web browser opens and sends you to SharePoint web page, proceed to log in to access the SharePoint storage site for your Teams channel.
In the SharePoint site, click on the “Sync” button in the toolbar:
Select the option in the pop-up dialog to “Sync Now”: