Nikon D500 - Manual (Page 90)

90 Menu Guide
When a picture is taken, the camera names the file by adding
one to the last file number used. This option controls whether
file numbering continues from the last number used when a
new folder is created, the memory card is formatted, or a new
memory card is inserted in the camera.
d7: File Number Sequence
G button
➜ A Custom Settings menu
Option Description
On
When a new folder is created, the memory card formatted,
or a new memory card inserted in the camera, file
numbering continues from the last number used or from
the largest file number in the current folder, whichever is
higher. If a photograph is taken when the current folder
contains a photograph numbered 9999, a new folder will
be created automatically and file numbering will begin
again from 0001.
Off
File numbering is reset to 0001 when a new folder is
created, the memory card is formatted, or a new memory
card is inserted in the camera. Note that a new folder is
created automatically if a picture is taken when the current
folder contains 999 pictures.
Reset
As for On, except that the next picture taken is assigned a
file number by adding one to the largest file number in the
current folder. If the folder is empty, file numbering is reset
to 0001.