AirDrop, once again, requires Bluetooth and Wi-Fi connectivity to function effectively. If something goes wrong with your Bluetooth or Wi-Fi network, you'll almost certainly experience problems with AirDrop transfers. In this instance, you might attempt the following steps:

1. Swipe up from the bottom of your iPhone screen to access the Control Center.
2. To turn Bluetooth off, tap the Bluetooth icon. To switch off Wi-Fi on your device, do the same thing with the Wi-Fi icon.
3. Tap the Bluetooth and Wi-Fi icons, respectively, after a few seconds to switch the features back on and re-enable Bluetooth and Wi-Fi services on your smartphone.