Can iPad support USB port device?
I got a device which is using USB cable, am I able to plug the device into iPad? The device is using to capture photo of iris
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Many USB devices require installation of device driver software - this being something that is not directly supported by iOS/iPadOS.
For iPad-compatible devices that do require driver-software, the manufacturer of the USB device will have created a companion App that can be installed from the Apple App Store. Check with the manufacturer of the USB device for compatibility with iPad (such devices often being identified as “MFI” - or “Made for iPad/iPhone”) and/or availability of a suitable companion App.
You might also consider searching the App Store yourself - perhaps searching by the name of the device or its manufacturer.