More than one "File Upload" field

I have a form where I need the user to upload an image of themselves, a biography, and a reference. One is an image format and the other two are document formats. I don’t want to confuse the user by having a “multiple” for just one field, but would rather have an input for each individual so that nothing is forgotten. When I try to do this in Bootstrap Studio, only one of the fields uploads anything. How can I have all three upload files?