The way I’ve been doing it is by uploading to redgifs.com and then putting that link into the “Link” field of a new Lemmy post. However, that is limited to only 1 minute long videos. I’ve seen people uploading to catbox.moe which has a 200MB limit, which should allow for much longer videos.
This is the non-OC account for dazedandconfused. Go to that account for OC content and naughty thoughts. This account will be for sharing porn that I like.