nineskeletor/config/packages/oneup_uploader.yaml

oneup_uploader:
    mappings:
        avatar:
            frontend: dropzone
        logo:
            frontend: dropzone            
        header:
            frontend: dropzone  
        niveau01:
            frontend: dropzone 
        icon:
            frontend: dropzone
        file:
            frontend: dropzone   
            namer: app.upload.samename         
            storage:
                directory: "%kernel.project_dir%/uploads/file"