I got a much better way that makes the videos autoplay as you scroll to them and stop when you scroll past 
Go to this link, click “Copy component”, paste it in Glide (Ctrl/Cmd + V or rightclick/hold panel on left with components and select Paste), drop it inside of your custom collection of posts, and open the component and configure these:
- Set videoUrl to the column where you store the URL of the video (Doesn’t work with YouTube video links)
- Set channelName to the name and channelProfilePicture to the profile picture of the user (You can achieve this by having a relation for the user who made the post, then lookup columns for that relation column > name/photo)
- Set description to the caption of the post
- Set Timestamp to the time the post was made. If you want in relative format (e.g. 2 days ago) add a Relative Time column on top of your Date and Time column and use that for the component.
- Set the relatedUser action to show detail screen for your relation to the post creator
- Set playReel to whatever you want to happen when you play the video. For example, if you want a view counter, add a number column for Views, and set the action to “Increment Views by 1”
Example:
You can then add a button block below the component in your custom collection for actions (like, comment, share, etc) and remove everything else except the button block and AI component