Nextcloud or a samba server are good options. But if storage is not a issue I'd recommend checking out syncthing. I run it on my server and sync some directories to my phone and other directories to my desktop. And one directory between phone and desktop(obsidian notes). I don't think you can run sycthing on iphones though.
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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Technically, I've done as you've described several times over. Did it with IOS and Android - I approached both with an open wallet and open to doing things differently than I was used to. Could say the same for several gaming consoles and Chrome. ALL have required concessions on my part that left a bad taste in my mouth - speaking strictly from a User Experience perspective.
The worst of it has been all the apps that dissappeared from the IOS Appstore - apps I paid for and now all that's available are pale imitations full of ads and demanding subscriptions.
I'm not asking the same apps to work across multiple decades either - the gap between my first iPad and my second was less than eight years.
You and I are in similar situations. I discovered Linux around 15 years ago and I wanted to fully switch over to it but found I couldn’t run games or photo/video/sound editing software the way I knew how (grew up with sailors discounts on the Adobe Suite).
Nowadays most of my previous hangups are solved. Almost all of my steam games work in Linux without any issue (1 or 2 games needed a single google search to paste the change needed to fix something), GIMP and Inkscape have way more extensions that increase QOL (not to mention Photopea being a literally photoshop clone with the exact same keyboard commands so your workflow doesn’t need to be relearned).
The only computers running windows in my house are my server (cause I just repurposed it and it’s working for now) and my VR computer (and that’s just because I’m lazy too since the Valve Index is fully Linux supported).
I use Windows at work and have no other choice. I don’t want any of my other computers to feel like my work computer. Feels like I haven’t left work.