The Share button lets people add a personalized message to links before sharing on their timeline, in groups, or to their friends via a Facebook Message. If your app is native to iOS or Android, we recommend that you use the native Share Dialog on iOS and Share Dialog on Android instead.
Apple introduced the share button with iOS 8 in 2014, and the feature lets you share documents, images, and other items between apps, services, and other people.
Apple’s products use an icon showing a box with an upward arrow. This icon is used on several Apple products: In iOS’s iWork, for sharing work on iWork.com. In Mobile Safari, to show a menu of options: “Add Bookmark,” “Add to Home Screen,” “Mail Link to this Page,” and “Print.”
In the project editor, in the top-right corner adjacent the project page button is a “Share” button which appears for an unshared project. Clicking this will share the project, opening the project page as well.
The orange button on the bottom right corner is your screen share button. When you’re ready to start sharing your Android screen, tap it!. You’ll see two privacy notifications pop up. This is to ensure you understand that your entire device screen is being shared.