Bug: `generateMarkdown`'s `alias` parameter has no effect for non-markdown files

[RyotaUshio]

Steps to reproduce:

• In the sandbox vault, turn off "use [[wikilinks]]".
• Add an attachment file such as PNG or PDF, say file.png.
• Open the dev console and run the following:

  const file = app.vault.getAbstractFileByPath('file.png');
  console.log(app.fileManager.generateMarkdownLink(file, '', undefined, 'Display text'));

Expected result:

![Display text](file.png)

Actual result:

![](file.png)

The alias parameter has no effect.

[RyotaUshio]

Now I read the source code from the dev tool, and it seems like it's intended.

I guess this design is because generateMarkdownLink generates an embed link for attachment files and display text is not important for embeds.

However, generateMarkdownLink is also used to generate a non-embed link like so:

app.fileManager.generateMarkdownLink(...).slice(1)

I do this for generating links for PDF files, and even Obsidian itself does the same thing in many places.

So I believe it will be beneficial to let alias work for attachments as well. If you choose not to do so, it should be clarified in the documentation.

[RyotaUshio]

For example, if I turn on "Use [[Wikilinks]]" and copy a link to a PDF annotation, this becomes problematic:

https://github.com/obsidianmd/obsidian-api/assets/72342591/736b51c0-8919-43f0-a17d-59d2a28f54dd