I have a lot of learning and recipe videos and user manuals in pdf format I want to have on my iPhone or iPad when I am out of reach of the internet. To get them totally out of Apple’s fatherly grip, I store the videos in “On My iPhone” in the VLC app and PDFs in the Acrobat app.
This works great. The only thing is that I have to keep my Mac and iPhone/iPad in sync manually.
I have done that on iOS 16. In Files I can copy a file or folder and then paste in the On my iPhone folder. I would assume that means that file will always be there regardless of what happens with iCloud or the network. And I suppose this should work the same on iPadOS.
I’m very much a Mac person and cannot imagine getting real work done on iPhone. But I have to say, IMHO the Files app has become a lot better and I find I can use it to do what I usually want to do in a quite intuitive way. I wish the Mail app had made similar progress lately.
An aside: If you have your iPhone set to dark mode and reply to these emails on your phone, the background is forced to white. And because it’s dark mode the fonts are almost white. So what you’re typing is almost impossible to read.