Which feature in macOS must be used to access AirDrop from within apps?

Accessing AirDrop from within apps in macOS is accomplished through the share button. This feature allows users to easily share content such as documents, photos, and links with nearby Apple devices via AirDrop. The share button simplifies the process by presenting a variety of sharing options, including AirDrop, to the user in an intuitive and user-friendly way.

The share button can be found in most apps and is typically represented by a square with an upwards arrow. When clicked, it opens a menu that includes AirDrop among other sharing options, right at the user's fingertips. This integration ensures a seamless experience when sharing files between devices.

Other options, like the file menu, the sharing pane in System Preferences, or the app settings menu, do not provide the same level of immediate access to AirDrop within the context of actively using applications. The file menu generally focuses on file management tasks, while the sharing pane in System Preferences is more about configuring sharing settings on the system level, and the app settings menu is intended for adjusting app-specific preferences rather than facilitating sharing. Therefore, the share button is the correct and most efficient method for accessing AirDrop within apps.