FujiFilm FF210003 Manual page 52

Uploading Pictures as They Are Taken
Pictures taken with ON selected for FTP OPTIONAL SETTING >
AUTO IMAGE TRANSFER ORDER in the network/USB setting
menu are automatically marked for upload.
Selecting Pictures for Upload During Playback
If b FTP TRANSFER ORDER or c FTP PRIORITY TRANSFER
ORDER is selected for D BUTTON/DIAL SETTING > a ISO
1
BUTTON SETTING, you can mark pictures for upload or change
or remove their upload marking using the ISO button during
playback.
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Uploading Pictures via FTP