Canon MX720 Series Online Manual page 68

*2 Feeding paper from the cassette (upper) can damage the machine. Always load in the cassette (lower).
*3 We recommend that you remove the previously printed envelope from the paper output tray before
continuously printing to avoid blurs and discoloration.
*4 When loading paper in stacks, the print side may become marked as it is fed or paper may not feed
properly. In this case, load one sheet at a time.
*5 Feeding paper from the cassette (lower) can damage the machine. Always load in the cassette (upper).