Why does it not describe using the camera adapters to transfer photos FROM your ipad to a memory stick?
Why does Apple not describe how to use the usb camera adapter to transfer photos FROM your ipad/phone to a flashdrive?
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The iPad User Guide is a rich source of information. Here is the relevant page of the online version of the Guide:
Connect external storage devices to iPad – Apple Support
The Guide is available both online using a web browser (such as Safari), or as an Apple Books download:
iPad User Guide - Apple Support
https://books.apple.com/book/id1567104892