[literallycancer]

If your distro has outdated packages, that's a problem with your distro.

You can always just open files with a CLI if you want to see the error messages.

What do you mean can't drag and drop on a window? That's literally how you add subtitles or open a file if you opened mpv from the shortcut, rather than by opening a file.

[Thaxll]

None of the distro keeps package up to date with mpv. Only rolling one are probably updated.

Adding a file does not enqueued them, it just open it and play it right away.

[valenceelectron]

Hold shift while dropping the file to enqueue it. At least on macOS that works.