Canon EOS 90D DSLR Camera with 18-135mm Lens - Manual (Page 507)

507
File Numbering Methods
The captured images saved in a folder are
assigned a fi le number from 0001 to 9999.
You can change how the image fi les are
numbered.
1 Select [ 5 : File numbering].
2 Set the item.

Select [Numbering] .

Select [Continuous] or [Auto reset] .

If you want to reset the fi le numbering,
select [Manual reset] ( = 509).

Select [OK] to create a new folder, and
the fi le number will start with 0001.
o If the fi le number in folder 999 reaches 9999, shooting will not be possible
even if the card still has storage capacity. The screen will display a message
telling you to replace the card. Replace it with a new card.
(Example) IMG_0001.JPG
File number