DaVinci Resolve 16

So, DaVinci Resolve is a free video editing program.
And I have some trouble with it.
I go to the folder that my video is supposed to be in, but I don’t find my video.
When I try to drag my video into the media pool, either from my desktop or my files, it doesn’t work. Is there a specific file type?
The only file that works, is the music.
Thanks in advance.

Can you send a link @Lydia_Song?