Nikon D780 DSLR Camera (Body Only) - Manual (Page 428)

382 Playback
1
Select a picture.
Display a picture in full-frame playback or playback zoom or
select it in the thumbnail list.
2
Choose [Select to send/
deselect].
Press the i button to display the i
menu, then highlight [ Select to
send/deselect ] and press J . Pictures
selected for upload are indicated by a
W icon; to deselect, repeat Steps 1
and 2.