How to access and read a file on a USB drive from IOS Connected via OTG cable to iPhone

Question

Can I access a text file on a USB drive and parse it from an iOS device? (Example: iPhone with OTG cord). Is there a USB device that typically mounts as a file system, such as on a MacBook

Use which library or framework?

Or, if not via an iPhone, is it doable with an iPad?

If there is a test.txt file on the USB drive, you can open it from an iPhone IOS app and read its contents as a string if it is connected via an OTG cable. alternatively, read a text file that has been opened line by line.