One thing you can do with an Android phone with a USB-C port (to the extent it's almost worth buying a dedicated sim-less phone for this task), is plug in a USB Hub, and then, plug a multi-tb hard drive, and plug in a card reader for CF/SD etc, and use the phone to copy files from the card, directly to the drive. It's a significant use case for field-backup during a trip, which used to be met by standalone devices (WD MyPassport Wireless, Neaxtto etc) - but those manufacturers have largely stopped making them, those remaining are now more video oriented, and hugely expensive.
Haven't heard of anyone managing this with a lightning-equipped iPhone yet.
Haven't heard of anyone managing this with a lightning-equipped iPhone yet.