Can't upload large video files for autoplay

I can make numerous videos autoplay on my pages, but I can't upload any video larger than 12mb. How can I upload larger videos?

I do not want to use YouTube or anything like that having names across my video. Here's what I do, but please tell me if you have a way to upload large videos.

I go to Design, Custom CSS, Manage Custom Files, Upload (your video)

Copy that code (I show it at bottom)

Go to your page, create an Embed or Code block and paste that code you just copied, I did add some more code to make it work on all devices, not just my personal page.

<center>
  <video autoplay="autoplay" loop="true" width="550" muted="muted" controls>
    <source src="https://static1.squarespace.com/static/636d6fd9f542a10598b6bd24/t/63b7430ad3ac8054cc6b8e45/1672954637057/name_of _my_video.mp4" type="video/mp4"/>
  </video>
</center>