I created a custom file type (to add documents and images). And in my content type, under allowed file types, I only checked my custom file type.
However, when I trying to upload a file, it is giving a choice to select "document" or "custom file type".  I don't want to have that choice. How can I prevent that choice menu from showing up ?

I can't disable "document" because it's used in other content types.  

Any suggestions ?