Add those permissions only that are required. Different usage scenarios and
                    components require different permissions. 
                Add those permissions only that are required and grant admin consent for
                    requested permissions for all accounts in your tenant. To set up permissions for
                    OneDrive online workflows, do the following: 
                
                    - 
                        Click the Microsoft Graph button under the
                                Commonly used Microsoft APIs group on the
                                Request API permissions page.
                    
 
                    - 
                        Select Application permissions.
                    
 
                    - 
                        Select the Files.ReadWrite.All checkbox under
                            the Files permission group.
                    
 
                    - 
                        Click the Add permissions button.
                    
 
                    - 
                        Click the Grant admin consent for [tenant name]
                            button and click Yes.