- It is open source and free.
- There are no ads at all.
- Large files transfer with no speed limit.
- It works without an internet connection.
- Files only travel inside the local network, which keeps your privacy safe.
- Make sure both devices are on the same wireless network.
- Open the app on both devices.
- On the sending device, pick the photos or files you want to transfer.
- Tap the recipient's name in the device list that appears at the bottom of the screen.
- The receiving device taps accept and the transfer is done.
Official link:
https://github.com/localsend/localsend
Scroll down to this spot and pick the installer for your platform

Out of 10, full marks — it is genuinely useful
It is written in Flutter, so I hardly need to explain the cross-platform part



