Why does the printer out a lot of blank paper after one successful print? / Why can't I print continuously？

A:①. Please cancel all printing sequences in the computer.
②. Load no less than 4 consecutive sheets of paper into the printer.
③. After the paper is stable, press and hold FEED (red/green light), and when you hear a beep, release the feed

The printer will learn the size of the paper at this time, and the top of the printer will light up in green when it stops. After the process is complete, the printer returns to normal.

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Why does the printer out a lot of blank paper after one successful print? / Why can't I print continuously？