Serviio

I added a folder to show video files on my TV, which works fine.
I then added some image files to the folder and updated the library to display both video and images media types, but when I do this I get two folders with the same name, one showing only video files and the other only showing image files.
How do I get Serviio to display both types of file within a single folder structure?

Unfortunately you cannot. Serviio (and other media servers as well) classify the media by type and only display them under the expected category of media. I tried it once myself and at the moment there's no way to make it display both.