Connect pendrive to iPhone with this device and expand storage / link in description

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Amazon links:
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This is a high-speed USB port (OTG) for all USB devices connecting to the iPad. Import photos to your iPad using this adapter. It is suitable for USB devices such as a camera, keyboard, flash disk, and so on. Please note that some big USB flash drives may not work if they require more power than what the iPad can supply. Its functions depending on the device's operating system and applications.
How to use USB drives with an iPad/iPhone | Lightning to USB Camera Adapter | Pen Drive or USB Drive