How would I submit/embed videos I've trimmed?

Apologies if this is the wrong place to ask this question. Using the upload image button and selecting my mp4 brings up an error red box mentioning something isn't a valid json token. Mastodon communities already make it possible to upload short clips. Would I just link to a Mastodon post?

I would like to gather ideas for those that might want to post small video clips to start discussions. Trying to avoid bloated websites like YouTube for uploading a small 1 min clip.