How to hardsub a video in Convert Video menu?

[Fanks]

I recently found out that in Convert Video menu you can add a subtitle file (.srt, ♥♥♥♥♥ .ssa) into a video and convert them into the format of your choice.

The problem is that I tried to do the hardsub an .mp4 file with ♥♥♥♥♥file but the subtitle doesn't show up after the conversion completed. So far, I only managed to do the soft sub into an .mkv file, but when I tried hardsub into .mkv file the subtitle also doesn't show up.

Is there some configuration I'm missing?
Any help is appreciated. Thanks.

edit: steam doesn't like I typed A5S so those censored words are "Aegisub Advanced SSA Subtitles"

[Movavi]

Hi, Fanks!

You need to click on edit, then go to subtitles tab and add subtitles. Then sure to click on hardsub feature and on green Apply button. Then it will be hardsubs.