Under the agreement, a curated selection of videos will stream on TikTok and also on the Disney+ streaming service, the companies said in a statement. Videos will appear on Disney+ under a Verts tab designed to capture younger audiences who devour vertical video on mobile phones. It is the first time TikTok videos will be shown on another platform. Disney+ and other streaming services are starting to embrace vertical video, a format that is growing rapidly in the United States. In addition to providing new content for Disney+, the deal with TikTok could help the company attract additional viewers to the streaming service.