Sandisk works fine in Mac and Windows - cannot see the device on iphone

I have had a sandisk 128GB USB3/iPhone drive for a while now. The drive works fine in any laptop I use it with but is not working in iOS (drive is not showing up in the iXpand app

for troubleshooting I have tried updating the firmware on the drive (no change)
I have reset my iPhone (no change) and iOS is currently 14.0.1 and has never worked in iOS 13

any ideas?

I am having same issue. After IOS 14.2 update my ipad and iphone has stopped detecting ixpand mini. It works fine in my windows laptop