Cloud-based tool for creating video interstitials

An interstitial creation interface is provided for display on a user device, the interstitial creation interface comprising a selectable interstitial indicator to add an interstitial to a playlist comprising a plurality of media items, wherein the selectable interstitial indicator is to be positioned between a first media item and a second media item of the plurality of media items. Responsive to a user selection of the selectable interstitial indicator, presentation of a plurality of user interface (UI) elements is caused to allow a user of the user device to specify interstitial configuration parameters for the interstitial being added to the playlist. User input is received for at least a subset of the plurality of UI elements to specify the interstitial configuration parameters for the interstitial. The interstitial is created based on the received interstitial configuration parameters, wherein the created interstitial is supplemental content to be added before or after one of a plurality of files of the plurality of media items.