FujiFilm X100VI Owner's Manual page 286

Uploading Photos and Movies as They Are Taken
Photos and movies shot with ON selected for Frame.io Camera
to Cloud > UPLOAD SETTING > AUTO IMAGE TRANSFER ORDER
in the network/USB setting menu are automatically marked for
upload.
Selecting Photos and Movies for Upload During Playback
If HFrame.io TRANSFER ORDER is selected for D BUTTON/DIAL
SETTING > a Fn1 BUTTON SETTING, you can mark fi les for up-
load or change or remove their upload marking using the Fn1
button during playback.
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Uploading Files to Frame.io