Extreme Portable is recognized by Windows, but not in iOS

Hey!

I have recently bought the SSD extreme portable and it works with windows fine, but with iOS( iphone), it doesn’t.

Other harddrives/SSDs are recognized in ios13’s files app, but the “extreme portable” isn’t.

I use the Apple USB Camera Adapter like many others. Most of hardrives work, but the extreme portable doesn’t.

Any ideas?
Does anyone know how one should solve this issue?