Konica Minolta Magicolor 7300 Reference Manual page 203

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If a tray is set to paper of the same size as the print job, even when the
Auto Continue function is enabled, instead of automatically continuing
printing, a message appears, instructing that paper be loaded into that
tray.
In addition, if paper of a different type and size is loaded into Tray 2
when the first tray runs out of paper during printing, printing cannot be
automatically continued.
If this occurs, load paper according to the message that appears in the
printer's control panel.
Tray Chaining and Auto
Continue
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