Adding user to Folders in Sharepoint

Navigate to the required location in Sharepoint

 

 

 Select the folder and choose the three dots 

 Choose the "Manage Access button" 

 

 

 Select the Grant Access option 

 

 

 Type the email address of the person you wish to share with in the box  

 

 

 Click the icon to the right of the name to change permissions for the user.  

 

 

 Finally select the Grant access button at the bottom.