Not able to convert audio to proper video file

Hello, maybe I’m too stupid but I tried endless video formats in order to import a converted audio file into a video file to use the audio in dorico. Is there any simple tool or simple tutorial to convert wav files into video files working with dorico? I’m using a mac.
I don’t know much about the different video codings and tired quick-time, iMovie, VLC. So far no success. I hope the update to use audio files in dorico comes soon but I desperately need a working solution now and I already spent hours not getting it to work.

I saw a YouTube of someone converting an audio file to video in Cubase. Basically he had the video show (only) a timecode on a blank screen as the music played.

You could try following these steps:

I think this was the video (and text article) I recalled.