AlfaSpaceNET

@sychn as per PM, here's a different way of doing what you are trying to achieve using this:
ACP -> Customization -> (Editor) Toolbars Click 'Add Button', and go to the 'Custom' tab Populate the fields as you wish, but adhere to the following specifics: Enable 'Use option?' Enter some text in the 'Option label' field (example: 'Link') In the HTML field, enter the exact code from the codebox provided in this post Click 'Save' You will now have a new button in your "Buttons not on editor", which you can drag and drop around the available editors On the front-end, click the button, paste the link into the provided dialog box field, and click OK HTML:
<p> <video controls=""> <source src="{option}">{option} </video> </p>  

Please go to support in the top right of your Admin CP, then select "clear cache". Once you have done this check again. It looks like its simply a cache issue you have there

This is not possible out of the box

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