My wife and I have home offices at opposite sides of the house with hardwired desktops and Wi-fi APs, but we can't AirDrop to each other as we're out of range for it.
If you want to send a photo to your friend from your iPhone, just click on the photo and click the "share" button, then you have many options, including sending it via Email..
What am I missing?
There is also localsend, but plainapp needs to run in only one device.
Can be self-hosted, if that's a concern.