Thanks for getting in touch! We strongly suggest that you create and activate your own custom theme 1 to preserve your customizations.
> I want that Headline come after Video Player and add Vimeo Description after that. How can i do this and after all which file should i edit for this change?
You will want to create a template 2 in your theme at gallery/players/normal/ajax.html.twig. The contents of your new template might look something like this:
Hopefully that gets you started in the right direction? Please let us know. Thanks!
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