Merging multiple documents to PDF using Microsoft Flow getting error "For application/pdf mime-type"

Hi Ben,

I am deffinately working with the JSON type editor, as the individual item shows "File 1, File 2, File n, etc."

Additionaly, the "File content" from the Get File Content card returns a 2D array which has 

"$content-type" 
&

"$content"

as its elements.

The array created in the image above "Append to array variable 8" returned, 

{"$content-type":"Document Library","$content":{"$content-type":"application/pdf","$content":"JVBERi0xLj~"}}

 which im assuming is not correct.

I have changed the array i am inputting into the "Merge PDF" card (resulting in the below structure), but am still receiving a "Bad Gateway" error.

Can you tell me the syntax expected by the "Merge PDF" card is?

Does it expect

[
  {
    "$content-type":"application/pdf", 
    "$content":"JVBERi0~"
  }
  {
    etc.
  }
]

 or is there some issue with the syntax of the "$content-type" element ("application.pdf" maybe?)

Thankyou for your help!

Thank you so much for the reply. After implementing content type in array still getting the same issue . Below is the screenshot:

but still getting the same issue .

Please help me on the above issue. Awaiting your response!