I want to check in fluid if the editor has added a PDF file to a content 
element but I'm not sure how to do that.

If the editor adds a PDF file (as a media asset) I want to display a button 
where the user can download this PDF, otherwise no button should be shown.

Now my code looks like this:
<a href="fileadmin/pdf_folder/{files.1.properties.name}" class="btn" 

This will generate a button no matter if the pdf is included or not. How can I 
check if a PDF was added by the editor in the content element?
I know that there is the possibility to use <f:if> with a condition but I'm not 
sure how the condition should look like in this context.

Thank you very much.
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