FujiFilm X-T2 Owner's Manual page 212

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The pictures in the current print order are indicated by a
u icon during playback.
Print orders can contain a maximum of 999 pictures.
If a memory card is inserted containing a print order
created by another camera, a message will be displayed.
Pressing MENU/OK cancels the print order; a new print or-
der must be created as described above.
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