Go to Contents.

Click on the Content that you want to use.

Click on Add and select Media Group from the dropdown list.

Click Add media and select media items. Click add to content.

You can edit durations of individual items or preview them. Click on the x icon on the top right to delete an item.

Rename the media group.

You can select the play mode between "Serial" and "Random".

Serial plays the items sequentially in each loop, random plays the items in a random order.
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Go back to content detail.

You will see the minimum and maximum duration among media group items.

You can use the common functionalities on media group (item tags, display rules, duplicate, etc.)