Things I have tried
When I initiate a wiki link by typing “[[“ a list of possible files to link to is displayed, but not when a insertion of a markdown link is initiated.
What I’m trying to do
I would like, when I initiate “insert markdown link” I would like a list of possible files to be linked to to be displayed.
Maybe this is why your links aren’t working. Are you typing these by hand when they don’t autocomplete?
If you have Wikilinks turned off in your settings, then when you type [[ to start a link, it will show the auto-complete, but then the link will be formatted as a Markdown link.
Insert Markdown link is the way you fallback to format generic web URLs and similar. So Obsidian is not assuming you are making an internal link when you start typing a URL. It will not make auto-suggestions.
Add internal link or by typing [[ signals to Obsidian that you want to make an internal link. And you’ll get auto-suggestions. And if you type the [[ with Wikilinks turned off, you’ll still end up with a Markdown link.
To say this again, if you are linking to your own notes, you always want to trigger
Add internal link. And HOW that formats depends on your Wikilink settings.
Insert Markdown link is a way to type a bare URL that you can fill with a link to a web-page or an internal note.
With wikilinks disabled, you still type [[ and you end up with an auto-completed Markdown link:
Gotta run. But I appreciate your speaking up. And your advice. Probably will do what you suggest. But I’d like to understand, and I don’t.
tl;dr: Type [[ and you’ll still get your Markdown links.