Nikon D780 Reference Manual page 818

Monitor
This movie
cannot be
edited.
This file cannot
be saved to the
destination
memory card.
See the
camera's user's
manual for
details.
772 Troubleshooting
Alert
Control
panel
—
—
Problem/solution
Selected movie cannot be edited.
•
Movies created with other devices cannot
be edited.
•
Movies under two seconds long cannot be
edited.
Files 4 GB or larger can only be saved to
memory cards formatted for FAT32 or
exFAT.
Use a memory card with a capacity over 32
GB formatted in the camera or keep file size
to under 4 GB.