There’s no free Apple file aystem support for Linux. Using the Apple file system is no option for me, since I need to share files between a DAW running on a Linux machine and Cubasis.
Btw. I still need to test, if connecting an USB drive directly to the iPad Pro or to my WLAN Router works. I suspect the first won’t, but there’s a little chance that Wi-Fi via the router might do the job.
Btw. the iOS app AudioShare is useful to workaround some common iOS file sharing issues.
At the moment I’m testing a Cubasis competitor on my iPad Pro that provides a lot of features Cubasis is missing. Maybe I’ll report back at gearslutz.