Nikon D3400 - Rotate Tall; Select to Send to Smart Device

189D The Playback Menu: Managing Images
If On is selected, “tall” (portrait-orientation) pictures will be
automatically rotated for display in the monitor (pictures taken
with Off selected for Auto image rotation will still be displayed
in landscape orientation). Note that because the camera itself is
already in the appropriate orientation during shooting, images
are not rotated automatically during image review.
Select photos for upload to the smart device. Movies can not be
selected for upload.
Rotate Tall
G button ➜ D playback menu
Select to Send to Smart Device
G button ➜ D playback menu
Option Description
Select image(s) Mark pictures for upload to the smart device.
Deselect all Remove the upload markings from all pictures.