Cartridge and method of supplying toner

A method of supplying toner to a cartridge, the method comprising:

• connecting, to a cartridge, a toner container storing toner to be supplied to a toner housing of the cartridge in a state where a reception shutter of the cartridge is located at a reception shutter closed position, the toner housing extending in a first direction, the toner housing including:
• a reception portion located at an end surface of the toner housing at one end in the first direction, the reception portion having a reception port for receiving toner into the toner housing;
• and a discharge port located between the one end of the toner housing and an other end of the toner housing in the first direction, the discharge port being located on a surface crossing the end surface, the discharge port being for discharging toner in the toner housing, the reception shutter being attached to the reception portion, the reception shutter being movable between the reception shutter closed position at which the reception port is closed and a reception shutter open position at which the reception port is open;
• moving the reception shutter from the reception shutter closed position to the reception shutter open position in a state where the toner container is connected to the reception portion;
• and
• supplying toner in the toner container into the toner housing in a state where the toner container is connected to the reception portion and the reception shutter is located at the reception shutter open position and the toner container is located above the cartridge.