For the element setting Image format, the following options are available for media elements:

• Mobile phone vertical screen (small)
• Mobile phone vertical screen (mdium)
• Mobile phone vertical screen (large)

These settings limit the maximum width of the output to 200, 300, or 400 pixels. At the same time, an aspect ratio of 9/16 is set in accordance with YouTube's recommendation. In addition, the video is displayed left-aligned instead of centered if necessary.