How to Make a USB Drive That Can Be Read on Macs and PCs
Erase and reformat a storage device in Disk Utility on Mac – Apple Support (UK)
Storage - All Accessories - Apple (UK)
Apple MFi Certified 256GB Photo-Stick for iPhone, 3 in 1 USB3.0 iOS USB Flash-Drive, Photo-Storage-for-iPhone, Memory-Sticks Thumb Drives for iPhone Backup Memory Stick for iPhone iPad Samsung PC iMac: Amazon.co.uk: Computers &
SanDisk Ultra Dual Drive Luxe USB Type-C Flash Drive 128GB - Apple (UK)
What's the difference between device storage and iCloud storage? – Apple Support (UK)