Nikon Z 8 Reference Manual page 287

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Recording Not Available
Voice memos cannot be added to videos or Image Dust Off reference data.
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Recording Restrictions
Voice memos cannot be recorded if:
the photo/video selector is rotated to 1 or
a multiple exposure is in progress.
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Caution: Recording Voice Memos
Touch controls are disabled and other pictures cannot be displayed while recording is in progress.
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Interrupting Recording
Pressing the shutter-release button or operating other camera controls may end recording. During
interval-timer photography, recording ends about two seconds before the next shot is taken; recording
also ends when the camera is turned off.
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Storage Location
Voice memos for pictures taken with two memory cards inserted and [Backup], [RAW primary - JPEG
secondary], [JPEG primary - JPEG secondary], [RAW primary - HEIF secondary], or [HEIF primary -
HEIF secondary] selected for [Secondary slot function] in the photo shooting menu are recorded
with the copies on both cards.
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Voice Memo File Names
Voice memo file names have the form "DSC_nnnn.WAV". The voice memo has the same file number
("nnnn") as the picture with which it is associated. For example, the voice memo for the picture
"DSC_0002.JPG" would have the file name "DSC_0002.WAV". Voice memo file names can be viewed on
a computer.
Voice memos for photos recorded with [Adobe RGB] selected for [Color space] in the photo
shooting menu have names of the form "_DSCnnnn.WAV".
Voice memos for photos recorded with a prefix other than "DSC" selected for [File naming] in the
photo shooting menu will be recorded with the selected prefix in place of "DSC".
Tip: Recording Using Buttons
Voice memos can be recorded using a control to which [Voice memo] has been assigned using
Custom Setting f3 [Custom controls (playback)].
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Recording Voice Memos