Embedded video in the whiteboard not showing up for participants

[xslx]

I'm using Zoom to teach online English lessons to a young student. I embedded videos into the whiteboard but my student sees a static image, she can't hear or see the video. I also tested this with a second computer, and faced the same issue. As a host I can see and hear the video, but the participant doesn't hear or see the video even though I'm sharing the whiteboard. 

I know I can share the video from Youtube by sharing my screen, but going back and forth between the whiteboard and screen-sharing other content disrupts the in-class acitivities. 

I'm using zoom workspace 6.3.6 on a Mac.

Thanks in advance for any help.

Does 

[BradyLi]

Are all participants granted view-only permissions? If they have view-only access, the current design does not allow interaction with elements on the canvas, including iframe objects. However, there are plans to enable iframe usage even in view-only mode.

[xslx]

There's only one participant and they're able to contribute to the whiteboard, too. But I'm the one pressing play, as I'd like to control when the video starts, so that we're both seeing it at the same time.

[Cinabarit]

How can we enable iframe interactions for viewer-only mode?