I tested the Apple Lightning to USB 3 Camera Adapter (MK0W2AM/A) with an iPhone X. A SSD Drive won't mount, even with external power. But a USB A 3.0 flash drive will.
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Lightning to USB Camera Adapter - Apple (UK)
Use Apple USB-A camera adapters with USB-A devices - Apple Support
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USB Camera Adapter, USB Female OTG Adapter Compatible with iPhone iPad, iPad USB Adapter with Charging Port, No Application, Plug and Play: Amazon.co.uk: Computers & Accessories
Anytrox iPhone USB Camera Adapter, USB Adapter for iPhone, 3 in 1 iPhone Dual USB OTG Adapter with Data Sync Charge Cable - Compatible with iPhone 14/13/12/11/X/XS/XR/8/7,Support Newest iOS 16: Amazon.co.uk: Computers
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CAMKIX Hot Shoe Mount Adapter Kit Compatible with Phone or Action Cam to the Flash Mount of your DSLR Camera - Record your Photo Shoot or use Phone Apps for Lighting, Monitoring
Lightning to USB Camera Adapter - Apple (UK)
Lightning to USB 3 Camera Adapter - Apple (UK)
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Mobile accessory review: Turtleback iPhone SLR Jacket: Digital Photography Review
365Astronomy Digital Camera, iPhone, Smartphone Adapter for Microstage
SD Card Reader for iPhone, Memory Card Reader with USB Camera Adapter Plug and Play Trail Game Camera SD Card Viewer Supports SD and TF Card Micro SD Card Adapter for iPad
AkHolz USB OTG Adapter, USB Camera Adapter for iPhone, for iPad USB Adapter USB 3.0 OTG Cable Supports Trail Game Camera, USB Flash Drive, Keyboard: Amazon.co.uk: Computers & Accessories
Adapter lets you mount SLR lenses on iPhone
Camera to USB 3.0 Adapter OTG Cable with Charging Port for iPhone 13 12 Pro XR 8 | eBay
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Adapter Puts Nikon and Canon Lenses on iPhone | WIRED
Lightning to USB 3 Camera Adapter - Apple (UK)
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DSLR Lens Adapter for Apple iPhone 4
Lightning to USB Camera Adapter - Apple (UK)
For Apple USB Camera Adapter Transfer Photos Videos with charging for iPhone | eBay
365Astronomy iPhone Smartphone Piggyback Adapter for BINOCULARS
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Sturdy Microscope Eyepiece Camera Adapter for Smartphone & iPhone | eBay