Printing system, printing system control method, and storage medium

A printing apparatus connectable with a sheet processing apparatus including (a) a binding device configured to execute, at a first binding position, a binding process for a first sheet conveyed from the printing apparatus, (b) a sheet insertion portion configured to receive a second sheet inserted by a user, and (c) a sensor configured to detect the second sheet which is received via the sheet insertion portion, wherein the binding device is configured to move a binding position to the first binding position and to a second binding position different from the first binding position in a sheet width direction orthogonal to a sheet conveying direction, and to execute, at the second binding position, the binding process for the second sheet based on the sensor detecting the second sheet, the printing apparatus comprising:

• a printing unit configured to execute a printing process in which an image is printed on the first sheet;
• and
• a control unit configure to:
• in a case where a print instruction causing the printing unit to execute the printing process and causing the binding device to execute the binding process is received and the second sheet is not detected by the sensor, cause the printing unit to execute the printing process on the first sheet based on the print instruction;
• and
• in a case where a print instruction causing printing unit to execute the printing process and causing the binding device to execute the binding process is received and the second sheet is detected by the sensor, restrict the printing unit from executing the printing process on the first sheet based on the print instruction.