Recording a short (14 second) video with a spherical (360 degree) camera and uploading it directly makes a distorted flat video.
Processing it through Insta360 Studio and exporting as a “360 video” now makes it a video that behaves more like a portal, where you can look up at the tree overhead, and down to the handrail at the edge of the walkway.
A 360 / spherical video on YouTube can allow part of a Portal experience without Hoverlay, but still requires the YouTube app.
Putting the same video (reduced in bitrate so it falls under 20 Mbytes file size) and placed in a Portal looks like this: https://hoverlay.io/space/05769 .
