It is best to use AirDrop to transfer photos and other files between Apple devices, but sometimes the AirDrop function will have some small failures that cannot be used, and the following will teach you how to solve it
1. Check if the device supports AirDrop
iPhone and iPad: Requires iPhone 5 or later, iPad 4 or later, iPad mini, or 5th generation iPod touch and later.
Mac: All Mac models released in 2012 and later running OS X Yosemite or later support AirDrop. You can click the buttons in the image below sequentially to confirm that your device is compatible with airdrop capabilities. If AirDrop isn't listed as an option, your Mac isn't compatible with that feature.
2. Check the AirDrop settings
Press and hold the Wi-Fi icon in Control Center to see the AirDrop feature, continue to press and hold to set it, and have three options: Receive Off, Contacts Only, Everyone.
Receive Off prevents others from sharing content with you via AirDrop, Everyone receives shared content from anyone, and Contacts Only receives content shared by contacts in contacts.
If you're having trouble using AirDrop, add contacts who need to share content to your contacts (fill in the email address or mobile phone number used by their Apple ID in their contact card), or try switching AirDrop to Everyone.
3. Switch between Wi-Fi and Bluetooth
AirDrop relies on Wi-Fi and Bluetooth to transfer files wirelessly. If you still can't get AirDrop to work, try turning both settings off completely and then turning them on again.
4. Turn off Personal Hotspot
If you host a Personal Hotspot on your iPhone to provide Internet access to another device, AirDrop won't work. The solution is to turn off Personal Hotspot. This will make it impossible for devices using hotspots to connect to the internet. When you've finished sending shared content via AirDrop, you can restart Personal Hotspot.
5. Make sure your iPhone or iPad is unlocked
If your device is locked or turned off, it won't appear on someone else's device as a device that can be used to send files over AirDrop. So, make sure your iPhone or iPad is turned on and unlocked when the display is on.
6. Bring the devices close to each other
When a shared Wi-Fi network isn't available, AirDrop relies only on Bluetooth to find devices and transfer files.
Bluetooth has a range of about 33 feet (10 meters) on a modern iPhone, so make sure you're using both airdrop devices in between, or you might not be able to use them.
If none of the above methods work, you can try restarting your device before trying to use AirDrop.