The SanDisk iXpand Flash Drive Luxe for iPhone and USB Type-C
The iXpand Flash Drive Luxe comes with not one but two connectors so you can easily move files between your iPhone, iPad Pro, Mac, and USB Type-C devices, including Android phones. Say goodbye to emailing photos between devices. Once files are on your drive, you can use the high-speed USB 3.0 connector to transfer them to your USB Type-C computer... More here.
This looks like a very useful solution and it's reasonably priced as well.