By implementing MGNLUI-2882, we introduced action for downloading binaries (images, documents, etc.). Action is by default available in DAM (see MGNLDAM-423).

Action class: info.magnolia.ui.framework.action.DownloadBinaryAction
Action definition class: info.magnolia.ui.framework.action.DownloadBinaryActionDefinition
Available properties:
binaryNodeName - name of the subnode that holds the binary property, default value: binaryNodeName
dataProperty - name of the property that holds the binary data, default value: jcr:data
fileNameProperty - name of the property that holds name of the binary, default value: fileName
extensionProperty - name of the property that holds extension of the binary, default value: extension