Open Teams and the team you wish to sync, pick your favorite channel, and hit the Files tab.
If you only want to sync files from the current channel, feel free to hit the Sync button. To choose from the entire team (all channels), instead choose Open in SharePoint.
The SharePoint document library will open in your default browser (depending on your environment you might have to log on with your Office 365 credentials).
Click the Documents, followed by the Sync button, and OneDrive will open.
Depending on whether or not you have synced your personal OneDrive or another SharePoint site you might need to log on and go through the first launch experience.
You can see in the above screenshot all channels are synced. If you prefer to keep only a subset of the channels you can click the OneDrive icon in the bottom right corner and choose Settings, followed by Choose folders.
If you sync the whole team, and someone adds a channel, those files won’t sync until you add the folder from Settings – Choose folders in OneDrive.
Video Explaining Process