Is it possible to upload a thumbnail to a video in Rise 360?

I've uploaded a video, but the thumbnail appears to be the first frame of the video, and I can't change this without changing the first frame.

This isn't ideal, as the video has an animated logo opener, so the first frame is just a white background. I'd prefer to upload a thumbnail of the full logo instead, while keeping the video as is.

I've tried an alternative where I've uploaded the video to YouTube, added a thumbnail through the YouTube publish process, then added this to the Rise course via the embedded video option, but the thumbnail appears blurry for some reason.

Any solutions or workarounds would be appreciated.