Windows computers (i.e. desktops and laptops) running a 64-bit version of Windows 10 and up — ARM devices not supported. Download Nearby Share and ensure Wi-Fi and Bluetooth are enabled on your Windows PC.
The devices should be close to each other, within 5 m (16 feet).
Yes. You can send files to anyone that has Nearby Share turned on, with their devices discoverable to you. After you choose their device as the receiver, they simply accept the transfer and the file will be sent over.