I made a similar thing on my home network. It uses php's built in file upload and runs in the web browser so you don't even need an app. It's just basic beginner level html and php in 2 files that goes on my lan server. Makes it super easy to transfer files between phones, windows pcs and Linux pcs.
I gave up on fighting with windows pcs to try getting them to connect to samba shares a long time ago and you'll never access a samba or windows network share on a smartphone without paying money for some shitty app anyway. Despite this relatively low-tech solution it ends up being more practical just because it's easy and convenient.
Uhh. Who's counterfeiting a cpu that only basically 2 factories in the world can make? Functional fakes are a thing for some really basic chips but an apple arm cpu seems like a little much.