### Bug description

I followed the instructions provided by the [quarto documentation](https://quarto.org/docs/presentations/powerpoint.html#powerpoint-templates) to customise my PPTX presentations via a template. I customised this simple template. When I render a presentation, it does not use the template.

### Steps to reproduce

1. Create quarto template via `quarto pandoc -o template.pptx --print-default-data-file reference.pptx`
2. Create sample presentation
3. Render via `quarto render hello.ipynb --to pptx`

See attached `template.pptx`, `hello.ipynb` and the resulting `hello.pptx`.
[Archive.zip](https://github.com/quarto-dev/quarto-cli/files/11743118/Archive.zip)


### Expected behavior

It should render my presentation using the template.

### Actual behavior

It uses the default template regardless.

### Your environment

- OS: MacOS Ventura 13.3.1 (a) 
- Python: 3.10.12
- Quarto: 1.3.361

```bash
pip freeze | grep jupyter
jupyter-events==0.6.3
jupyter-lsp==2.2.0
jupyter_client==8.2.0
jupyter_core==5.3.0
jupyter_server==2.6.0
jupyter_server_terminals==0.4.4
jupyterlab==4.0.2
jupyterlab-pygments==0.2.2
jupyterlab_server==2.23.0
```

### Quarto check output

```bash
quarto check

[✓] Checking versions of quarto binary dependencies...
      Pandoc version 3.1.1: OK
      Dart Sass version 1.55.0: OK
[✓] Checking versions of quarto dependencies......OK
[✓] Checking Quarto installation......OK
      Version: 1.3.361
      Path: /Applications/quarto/bin
```


2023-06-14T07:55:41Z
Fohlen
documentation good-first-issue powerpoint
Future
open
Quarto does not render custom PowerPoint template from Jupyter notebook
https://github.com/quarto-dev/quarto-cli/issues/5918