Is it possible to use the "video background" div block with CMS items in Webflow and upload videos to CMS items for dynamic calling in a template?

You cannot upload actual video files to Webflow CMS and dynamically use them as video backgrounds, but you can dynamically use video URLs (like YouTube, Vimeo, or hosted MP4 links) with some limitations.

1. Understanding CMS Support for Video

• Webflow CMS supports video URL fields, not file uploads of video formats (like .mp4 or .mov).
• The supported format uses a Video Link field for platforms like YouTube or Vimeo.
• Webflow doesn't let you upload video files directly to a CMS item – only images, files (PDFs, etc.), or external URLs.

2. Using Background Video Components with CMS (Limitations)

• The Background Video component in Webflow only supports manually uploaded MP4/WebM video files.
• You cannot bind this background video element to a CMS field.
• That means you cannot dynamically change a Background Video using CMS data out of the box.

3. Workaround: Embed Dynamic Video as Background-Like Content

To simulate a dynamic video background using CMS:

• Add a Video Link field to your CMS Collection (YouTube/Vimeo URL).
• On your Collection Template page, insert an Embed element.
• Add the embedded video using the URL dynamic field (from the CMS).
• Apply custom CSS to:
• Make the embed fill its container
• Position the video absolutely with z-index: -1, to mimic a background effect.
• Remove UI controls if needed by adding params (e.g., ?autoplay=1&mute=1&controls=0&loop=1).

4. Hosting Custom MP4 Video Files

If you need to use actual video files (MP4) dynamically:

• Host the videos externally, e.g., on Amazon S3 or another CDN.
• Save those public MP4 URLs in a CMS Plain Text field.
• Use the Embed element and pull in the URL dynamically.
• Code a <video> tag with desired attributes (autoplay, muted, loop, playsinline) and bind the src to the CMS field.

Example (do not paste in code block in Webflow, just directly into Embed):

<video autoplay muted loop playsinline>  <source src="YOUR_DYNAMIC_URL_HERE" type="video/mp4"></video>

Replace "YOUR_DYNAMIC_URL_HERE" with Webflow’s dynamic field from your CMS – click the “+ Add Field” button in the Embed.

Summary

You cannot directly use the native "video background" block with CMS video uploads, since Webflow CMS doesn’t support video file uploads or dynamic binding for that element. However, using hosted video URLs and custom embed code, you can replicate a dynamic background video experience in CMS templates.