Managing Media Libraries

Hello, for some reason I'm not able to update the file name and location at the same time. Can you please provide an example of how to do so?

Here's my code:
public async UpdateMediaFile(MediaFileDto mediaData)
var mediaInfo = mediaFileInfoProvider.Get(mediaData.MediaFileId)
if (mediaInfo != null)
// Updates the media library file properties
mediaInfo.FileName = mediaData.FileName;
mediaInfo.FilePath = $"{mediaData.FilePath}/{mediaInfo.FileName}{mediaInfo.FileExtension}";
// Saves the media library file
mediaFileInfoProvider.Set(mediaInfo);

Also, how can I retrieve the list of folders in a Media Library and how can I check if a folder exists?

Thanks, Patryck Thomas