Goal: Often I over use my daily limit data to download YouTube videos from my mobile data. Set YouTube video download over Wi-Fi only in the YouTube app. 
Steps:
action: action_type: open_app
app_name: YouTube
step_instruction: Open the YouTube app
action: action_type: click
step_instruction: Click on the profile icon at the top right of the screen
action: action_type: click
step_instruction: Click on the Settings icon
action: action_type: click
step_instruction: Click on the Downloads tab
action: action_type: scroll
direction: left
step_instruction: Swipe right the Download over Wi-Fi only bar