Bulk create dev resources across multiple files. Dev resources that are successfully created will show up in the links_created array in the response. If there are any dev resources that cannot be created, you may still get a 200 response. These resources will show up in the errors array. Some reasons a dev resource cannot be created include: - Resource points to a `file_key` that cannot be found. - The node already has the maximum of 10 dev resources. - Another dev resource for the node has the same url.