For photos, either Photos app or Lightroom cloud is what I have used. I have a usb-c sd card reader that I use to upload photos onto the iPad. From there they e

For photos, either Photos app or Lightroom cloud is what I have used. I have a usb-c sd card reader that I use to upload photos onto the iPad. From there they end up on all my devices. The nice thing is this works if I instead upload them onto my MBP or took pictures with my iPhone. For files, iCloud has worked fine. Personally, I don't want to think about moving files from one device to another. I want them available on all devices regardless of where they were created/added.