MMbox not working

hello
in my images folder I've added a folder named mbox and put the file minu_baeckereibrandlsmall.mp4 inside. In the same folder I've put the image for the movie with the name thumbfilm.jpg.
In the plugin-parameter i've set the difault folder on mbox.

Then I've created a custom modul and put inside the following code (without space after and before brackets).

{ mbox:minu_baeckereibrandlsmall.mp4|352|288|title=M inu bei uns zu Besuch |vthumb=thumbfilm.jpg|height=288|width=352|caption =Minu bei uns zu Besuch }

But the movie is not working.

Can you help me please?

Many thanks in advance.
Bob

Just a note: If I want to create a new module, there is no "multimedia box"-module ...


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