A request to perform an operation on an object in a first storage system may be received from a client computing device via a local area network or a wide area network. Mapping data that associates an account identifier from the request to perform the operation on the object in the first storage system to a volume of a file system of a second storage system may be received. The second storage system may be mounted to perform the operation using the file in the second storage system that corresponds to the object in the first storage system. The second storage system may be mounted by using the account identifier from the mapping data.