How to AirDrop files from your iPhone or iPad
You can AirDrop files from any iPhone or iPad app that includes the built-in Share sheet, and you can share with anyone, and any of their devices, that show up in the Share sheet.
Open the app that you want to share something from (e.g. Photos).
Select the item you want to share.
1. Tap the share button (looks like a box with an arrow pointing up, or sometimes just the word "Share").
2. Tap the intended recipient's avatar when it appears in the AirDrop row.
Because AirDrop shows your picture for any and all contacts, if you're trying to AirDrop to someone with multiple devices, you could see their picture multiple times in the Sheet. You will see their device name, however, which should make sure you pick the right one.
How to troubleshoot AirDrop on iPhone and iPhone
If contacts don't show up in the AirDrop interface, try these solutions, in order:
Toggle Bluetooth and/or Wi-Fi off and back on, or toggle Airplane Mode on and off to reset the connections.
Turn off Instant Hotspot to free up the Bluetooth and Wi-Fi connections.
Temporarily switch to Everyone to remove any chance of contact mismatch.
By: Mikah Sargent, Rene Ritchie from iMore.com 21 May 2018