When I try to embed a demo video that has a portrait design (e.g., survey123 demo from a phone) it gets rescaled and ends up missing part of the video. This happens whether I nudge it or embed it full screen. I tried also resizing the canvas (need to keep the ratio), as this works with images when I reduce the number of pixels, but it hasn't worked with videos so far.
Here is a story map link with examples of this issue: Story Map Example