CONFIGURATION
At first go to edit article where you want to show Before After Picture Gallery. Than give {before_after} Short code in your article. Than Save and Close.
In first image as given below set Gallery Name, Background Color, Border color and Sliding Bar. (See image - 1)
Then Set image 1 to 5 and 6 to 10 with After and Before image or picture. (See Image - 2).
Go to article where you set the short code. Thanks.
Image - 1
Image - 2