One fix, for the oldest open bug.
Discord embeds (#77, #100). Share pages told Discord to use a Twitter player card pointing at the raw video file. That tag must point at an embeddable HTML page, and Discord prefers the player card over the regular video metadata, so when the player turned out to be unusable Discord rendered nothing at all. Just a bare link, every time. Share pages now serve plain OpenGraph video metadata, the same pattern used by self-hosted sharers whose embeds work, with a direct file URL that carries the real .mp4 extension. Combined with the https metadata fix from v1.3.2, pasted tunnel links should finally unfurl into a playable video.
If you tried this before, make sure to copy a fresh link after updating. Discord caches what it saw for a given URL for about a day, and every daemon restart generates a new tunnel address anyway.
Update with yay -Syu vice-clipper (or your AUR helper of choice).