oneup/uploader-bundle

config/packages/oneup_uploader.yaml

# Read the documentation: https://github.com/1up-lab/OneupUploaderBundle/blob/master/Resources/doc/index.md
oneup_uploader:
    mappings:
        # This is a mapping example, remove it and create your own mappings.
        gallery:
            frontend: dropzone # or any uploader you use in the frontend

config/routes/oneup_uploader.yaml

oneup_uploader:
    resource: .
    type: uploader