Information processing system, program, and requesting method

An information processing system including at least one input-output device and performing a sequence of processes using electronic data that include image data and print data includes a hardware processor that executes a program so as to implement: an input-output service supply unit configured to perform a collaboration process of causing a hardware computer system implementing an external storage service to collaborate with the input-output device, a request data generation unit configured to generate request data bound for the input-output service supply unit based on metadata, and a request unit configured to request the input-output service supply unit to perform the collaboration process using the request data.