GetFilesAsync is not returning all the files in the “My Documents” folder

The following code should return a list of all files in the “My Documents” folder:

    var files = await KnownFolders.DocumentsLibrary.GetFilesAsync();
    List<FileInformation> filesList = new List<FileInformation>();
    
    System.Diagnostics.Debug.WriteLine($"File count: {files.Count()}");

The returned count from this code is (in my case) 11. However, excluding folders, there are 61 files in that directory for me. When I iterate through the collection, it does indeed find 11.

After scratching my head for a while, I finally realised that the answer to my question was my own blog post. It only lists the allowed types.