Can somebody point out the fault in this snippet for downloading a file entity. I am trying to replace or use existing file dynamically using migrate_plus. When I give a variable it doesn't seems to pass to 'download' plugin. If I hard code the value to 'replace' or 'use existing' it works.
file_config_keys: plugin: default_value default_value: "use existing" uri: plugin: download source: - '@source_image_url' - '@dest_image_uri' file_exists: '@file_config_keys' destination: plugin: 'entity:file' migration_dependencies: null