In Joomag, you can add pop-up windows with custom videos to your publications. Here's how:
1. Open a publication in Creative Studio.
2. Click on the element to which you want to link the video pop-up (e.g. a button or text box).
3. In the Properties panel, click the Link option and select Pop-up from the dropdown.
4. Select Video as the pop-up type.
5. Enter the video URL in the field provided.
6. Click Apply to save.
For more details on linking elements, see adding hotspots to a publication.