### Bug description

On 1.3.310, with this URL:

https://substackcdn.com/image/fetch/w_1456,c_limit,f_webp,q_auto:good,fl_progressive:steep/https%253A%252F%252Fsubstack-post-media.s3.amazonaws.com%252Fpublic%252Fimages%252Fced5d5ad-a0d6-44aa-b6f5-73c0a937d016_3553x5273.jpeg

```
running xelatex - 1
  This is XeTeX, Version 3.141592653-2.6-0.999995 (TeX Live 2023) (preloaded format=xelatex)
   restricted \write18 enabled.
  entering extended mode
  
updating tlmgr

updating existing packages

compilation failed- error
LaTeX Error: Cannot determine size of graphic in index_files/mediabag/ced5d5ad-a0d6-44aa-b.webp (no BoundingBox).

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.1296 ...iles/mediabag/ced5d5ad-a0d6-44aa-b.webp}
```

My _quarto.yml:

```yaml
  pdf:
    papersize: "Letter"
    mainfont: "Georgia"
    documentclass: scrbook
    standalone: true
```


```sh
 quarto list tools
[✓] Inspecting tools

Tool         Status            Installed     Latest
chromium     Not installed     ---           869685
tinytex      Up to date        v2023.04      v2023.04
```


### Checklist

- [ ] Please include a minimal, fully reproducible example in a single .qmd file? Please provide the whole file rather than the snippet you believe is causing the issue.
- [X] Please [format your issue](https://quarto.org/bug-reports.html#formatting-make-githubs-markdown-work-for-us) so it is easier for us to read the bug report.
- [ ] Please document the RStudio IDE version you're running (if applicable), by providing the value displayed in the "About RStudio" main menu dialog?
- [X] Please document the operating system you're running. If on Linux, please provide the specific distribution.
- [ ] Please provide the output of `quarto check` so we know which version of quarto and its dependencies you're running.
2023-04-06T16:07:04Z
richardsprague
enhancement
Future
open
PDF enhancement: support best-effort format conversions
https://github.com/quarto-dev/quarto-cli/issues/5113