Trying to add audio

I have an MP3 that I need to write a string arrangement to. I have converted the MP3 to MP4, MOV & AVI files. Every time I try to attach to Dorico I get a window that says “The video format is not supported”.
Not sure what to do. Any suggestions?
Dorico 4.3.3
Windows 10

Hey, you can do a search here on video formats and get a better explanation than I could give. It’s not a bug , but it is a common thing to have issues getting right, and so plenty of discussion and Step by step help to be found.

You need to make sure that your video file does have a video stream as well as an audio stream. Even a static image will do.