To make a video hosted on Dropbox autoplay when it is scrolled into view on your Webflow site, you can use some custom code and the interactions feature in Webflow.
First, make sure your video is properly embedded on your Webflow site. You can do this by creating an Embed element and pasting the Dropbox video's embed code into it.
Next, you'll need to add a class name to your Embed element. You can do this by selecting the element and going to the Settings panel on the right-hand side. In the Class field, enter a unique name for your class, such as "autoplay-video".
Once you have your embed element with the class name set up, you can move on to defining the interaction that will trigger the autoplay when the video is scrolled into view.
1. Select your embed element, then go to the Interactions panel.
2. Create a new scroll trigger interaction by clicking the "+" button next to Scroll into View.
3. In the "Scroll into view" interaction settings, choose the element that will trigger the interaction. For example, you can select the section or container that wraps your video.
4. In the settings for the interaction, choose the action "Start animation". This will allow you to define what happens when the element is scrolled into view.
5. Click the "+" button in the "Start animation" settings and add a new "Set Element Display" action.
6. Select your embed element (with the class name) as the target element for this action.
7. In the action settings, set the Display property to "Block". This ensures that the video is visible when it starts playing.
8. Click the "+" button again and add a new "Play" action.
9. Select your embed element (with the class name) as the target element for this action.
10. Save the interaction.
Now, when the specified element is scrolled into view, the interaction will trigger and the video will autoplay.
Please note that autoplaying videos can have negative effects on user experience and page performance. Autoplaying videos with sound can be intrusive, so it's a good practice to provide controls for users to play and pause the video themselves. Additionally, consider optimizing the video file size and format to ensure faster page loading times.