The phone could be operated in dual window mode, giving users the ability to operate a couple apps at once. (androidauthority.com)
To use this feature, Open the recent menu and tap on Dual window and select the apps that you want to use. (phoneradar.com)
For example, if the file manager and messaging app are opened in Dual Window, you can easily drag a photo from the file manager into the messaging app. (greenbot.com)