LocalSend is an application for cross-platform file-sharing with a user experience similar to Apple's proprietary AirDrop.
https://localsend.org/
It can be more convenient than sharing via #Syncthing or #Nextcloud for large file transfers or one-off transfers between devices, especially across devices running free and proprietary operating systems.
Alternatively, you can transfer files via Bluetooth old-school style, but #LocalSend uses Wi-Fi or ethernet which are much faster.