The app is an IOS app so there is one reason it won't work - http://computerelectronics.us/product/jcpal-isave-lightning-connector-usb-3-0-flash-drive-16gb-for-iphoneipadioscomputersrose/
That shouldn't stop you opening the flash, I think mac's would still format the USB as fat32. I might be wrong as never used a Mac.