There is no way, in this sub or any other. Lemmy still doesn't support video upload. And even if it did, video takes so much space that the instance would have to recode it, which would take a lot of CPU/GPU power, so even video upload becomes a thing some day, I seriously doubt most instances will have it enabled by default. NSFW instances, maybe, but regular ones, probably not.
voyager.lemmy.ml is still bugging, but worked yesterday so it'll probably not be for long, i'll stay here today currently testing the menu for full-screen pictures.