Where is “go to file” button on mobile?

Where is the “go to file” button when looking at a repo on my phone? I can’t see it.

And I try to “Request desktop website” in iOS Safari and I still get the mobile website. I know the button exists on the desktop website.

It’s supposed to appear in the “…” button next to the branch menu.

But there appears to be a bug in GitHub, because “Go to file” is missing when you open the “…” menu from the repository root.

There doesn’t seem to be any way to report bugs, so you might have to wait for someone at GitHub to stumble across it on their own.