This, unfortunately, does not address my use case, which is to make individual files invisible, but still referenceable.
I currently have a Hazel rule that notices when I drop a PDF into Obsidian and it automatically creates a markdown file with the same name and some frontmatter that gets extracted from the PDF, along with an ![[the-pdf-file.pdf]] to render the contents of the PDF into my Markdown. This works wonderfully to add the ability to put metadata on my PDFs within Obsidian.
It would just be so nice to make the PDF itself invisible, so I don’t see everything twice in my file explorer.