Videos are not loading / html codes are deleted

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Videos are not loading on pages.

Own html codes are deleted from the system

And when I use insert with media only the following    <video controls = "controls" width = "300" height = "155"> </video>    appears but the video cannot be seen. 

Why does eCommerz not allow the use of my own html codes? Html codes are deleted every time they are saved.

It's not more funy. I thought it was a well-engineered piece of software. Here you stumble from one extreme to the next. Very sad

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what page are you  trying to add it to?  Blog  / Site Pages?

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In both cases I have problems with video playback.

Whatever I do, the following keeps coming up: <video controls = "controls" width = "800" height = "400"> </video>

This appears when I insert a video with  ---Insert - Media  and then paste the video from ./images/uploads/media/xxxxx.mp4  for example . When I integrate the video using the following html codes:

<div><video preload="metadata" autoplay="autoplay" controls="controls" width="100%" height="auto">
                            <source src="https://domain.com/images/uploads/media/welcome.webm" type="video/webm" />
                            <source src="https://domain.com/images/uploads/media/welcome.mp4" type="video/ogg" />
                            <source src="https://domain.com/images/uploads/media/welcome.mp4" type="video/mp4" /><br />
                            <br />
                                    </video></div>

The result is then as follows: 

<video preload="metadata" autoplay="autoplay" controls="controls" width="100%" height="auto">

</video>

But the video itself cannot be seen.

Now I am curious what that could be.