New to your iPad with iOS11 is drag & drop (shortened to D&D.) And the great news is that drag and drop is SYSTEMWIDE, meaning that you can now move text, contacts, notes, reminders, images, URLs, maps, files, and even attachments from one app to another. All it takes is a single tap and hold (long press) to pick up your content and drag it to another app.
So go ahead and drag and drop between apps like Mail, Notes, Reminders, Maps, Contacts, Messages, even Safari.
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Drag & Drop in iOS 11 & above: The Basic Moves
Lift: Long Press to select content 
Drag: Tap to Add more content. Hover to Navigate where you want content to go (green plus sign + shows what apps support D&D) 
Set Down: Drop content (to copy or move), and it populates into your app
D&D a Single File
The easiest way to D&D on your iPad is by opening two apps in split-screen. For example, Photos and Messages. Open Photos and then grab Messages from your Dock and drop it to the left or right side of your iPad—keep Messages as an overlay or pull the top tab up for split-screen mode. Now that both apps are running side-by-side tap a picture from Photos and drag it to Messages, then drop it in. It’s that easy!
Step 1 
Step 2 
Step 3 
D&D Multiple Items
And it doesn’t stop there. iOS11’s D&D (drag n’ drop) also supports Multi-Touch. So you can pick up and add multiple items by tapping them. Start by dragging one item and then tap to add others.
Just like the single file example, the easiest way to drag multiple items from one app into another is by using your iPad’s split-screen. In this example, let’s email some contacts.
First, open your Contacts App, then using split-screen functionality, open Mail and open an email or compose a new message. Then, long press on one of the contacts you want to send. Hold that press and slightly drag it. That contact now pins to your finger. Maintain the press and tap all the other contacts you want to send. As you tap each additional contact, it updates the number of items attached to the original press. 
Once you select all your contacts, drag it over to your email. As you hover over the message, a green plus sign + shows the number of attached item. To add these to your email, simply release. And the contacts populate. 
D&D into Your Dock
There’s even a spring-loading D&D feature using your iPad’s Dock.
First, open an app as normal. Then tap your content. With your other hand (or finger) swipe up your Dock. Next, drag your content and hover over any D&D supported apps’ icon in the Dock. If the app supports drag and drop, the app springs open. Then, tap where you want the content to go and just drop it.
Cancel A Drag & Drop
Finally, something that is easy. To cancel, just let go of your drag. Or swipe totally off screen–that seems to work to!
Drag & Drop in Maps
First off, Apple really improves its Map App in iOS11. And now we can all drag and drop locations too. It’s easy to send a location to your friends or colleagues by dropping that place into Mail, Messages, or any D&D supported third-party app. Working in Split Screen Mode makes this all possible. So open Maps and then open Messages side by side or have an app panel floating above and then just long press, drag, and drop that location into Messages. Easy-peasy!
Drag and Drop for Apple Maps currently only works on iPads–BUT we are really hoping it comes to iPhone, cause let’s face it, most of us use Apple Maps on the go, with our iPhones!
And the other Maps improvements?
- Do Not Disturb While Driving
- Directions change now if you stray from the original route
- Indoor Maps for Malls & Airports
- Highway & Road Lane Guidance
- Speed Limit Indicators
- Landscape view shows more of the map
- One-Finger Zoom Control
- Simplified Map View for Directions
- Alternative routes during navigation for CarPlay
Move from One Hand To Another
With iOS11 and an iPad, transferring drags between your fingers or hands is simple. Just maintain the long press. You can even start multiple drag sessions at once by long pressing with multiple fingers (or hands) at the same time.
D&D Protects Data
Unlike universal clipboard, Drag and Drop is secure in a way that the pasteboard isn’t. That’s because your D&D data is only visible to your destination app, not ANY and ALL apps (like the clipboard.)
Fully Apple Supported and Third Party Apps Too!
Drag and Drop fully supports most of Apple’s Native Apple Apps and third-party apps are adopting it too!
To check D&D compatibility, if you see a green plus sign icon (+) when dragging into an app, that’s your signal that the app supports drag and drop. 
Apple Stock Apps that Support Drag and Drop:
Home screen, Dock, Reminders, Calendar, Messages, Spotlight, Files, Safari, Contacts, iBooks, News, Notes, Photos, Maps, Keynote, Pages, and Numbers.
Drag n’ Drop does NOT work in ANY folders labeled as deleted–such as the Recently Deleted folder in Photos. If you want to drag and drop an item from these folders, move them to another folder first.
Want D&D on Your iPhone?
It’s complicated. For now, your iPhone supports a very limited drag and drop. Basically, your iPhone’s iOS only allows you to move objects around inside an app (and it only work with apps that support D&D.)
For the iPhone, iOS11’s Files App appears to support drag and drop fully. And we’re able to drag & drop images files between My Albums in Photos.
Here’s the complicated part: app to app drag and drop functionality does exist in iOS11 for iPhones—but it’s mostly disabled and not accessible to users. Apple contends it disabled drag and drop because of iPhone’s small screen, its lack of a Dock, AND it’s current inability to split-screens or show multitasking. Plus drop and drag really needs multiple fingers or hands, so using it with an iPhone is not exactly easy.
So for now, inter-app drag and drop remains a potential feature. Perhaps in the next generation of iPhones?