Unable to create PPTX from default PPTX Reference Document using Markdown

[Phillip Dudley <predatorian3-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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I wanted to try making a PowerPoint using Pandoc and Markdown, but use a 
template that had some images already in the template. I saw that you can 
generate a reference document by doing:

   - https://pandoc.org/MANUAL.html#options-affecting-specific-writers

The command:

    pandoc -o custom-reference.pptx --print-default-data-file reference.pptx

Then I added a background image to the first slide, saved the 
custom-reference. I then tried to build the new PPTX using

    #cat Makefile
    .PHONY: build

    build:
        pandoc \
            --reference-doc custom-pptx-reference.pptx \
            --output slides.pptx \
            content.md

I then get the following errors:

filbot@pop-os ~/D/D/L/PPTX> make build
pandoc \
    --reference-doc custom-pptx-refernce.pptx \
    --output slides.pptx \
    content.md
Could not find shape for Powerpoint content
make: *** [Makefile:4: build] Error 63


Am I misinterpreting the documentation on how to use this?

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