I have an iPhone. I run the Apple iCoud suite on Firefox 45 under ArcaOS. in Photos, I can browse and download photos (upload, too.)
I can also attach the iPhone to the OS/2 computer with USB. The phone mounts as a Camera. Cameraderie works just fine. I can download photos from the phone and delete the ones I don't need from phone memory.
I run SAMBA server on OS/2. The iPhone can browse the OS/2 machine and most apps can load and save files to the OS/2 machine.
I run VNC server on OS/2. I can run the OS/2 desktop on the iPhone (or iPad, which has a better screen for the OS/2 desktop.)