(iOS) 

Use the Photos App to view downloaded videos.  If it’s a recent video, start with the Recents folder.  Video and Photos can be located under the ./internal storage/DCIM folder. 

(Android) 

Your phone should have a default "Gallery" application.  Open the Application.  Within Gallery, videos can be located in an Album titled "Drive_Smarter".  The location of the folder is ./internal storage/DriveSmarter/Drive_Smarter. Within Gallery, Drive Smarter Photos can be located under Images.  The location of the folder is ./internal storage/DriveSmarter/Images.