To embed a Spotlightr using the Oxygen builder you need to use the "Code block" element here:

Then click on the "PHP & HTML" button:

Delete what is in that field by default and paste in your Spotlightr embed code and click on Apply Code:

Once you do that, your video might be small and off-center like this:

To fix that try the following...first make sure you activate "Stack Child Elements Vertically" and then Center the Alignment Horizontally:

And then go to the Advanced tab and then Layout:

And then activate "stretch" under Align Items and Align Content and then Save your changes:

Your video should now look like this:

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