* - content : the raw file contents
* - dst : destination storage path
* - overwrite : overwrite any file that exists at the destination
+ * - disposition : Content-Disposition header value for the destination
* - async : Status will be returned immediately if supported.
* If the status is OK, then its value field will be
* set to a FileBackendStoreOpHandle object.
* - src : source path on disk
* - dst : destination storage path
* - overwrite : overwrite any file that exists at the destination
+ * - disposition : Content-Disposition header value for the destination
* - async : Status will be returned immediately if supported.
* If the status is OK, then its value field will be
* set to a FileBackendStoreOpHandle object.
* - src : source storage path
* - dst : destination storage path
* - overwrite : overwrite any file that exists at the destination
+ * - disposition : Content-Disposition header value for the destination
* - async : Status will be returned immediately if supported.
* If the status is OK, then its value field will be
* set to a FileBackendStoreOpHandle object.
* - src : source storage path
* - dst : destination storage path
* - overwrite : overwrite any file that exists at the destination
+ * - disposition : Content-Disposition header value for the destination
* - async : Status will be returned immediately if supported.
* If the status is OK, then its value field will be
* set to a FileBackendStoreOpHandle object.