Which interface item in Final Cut Pro shows details about the upload's progress to an online host?

The Background Tasks button is the correct choice because it provides a detailed overview of various tasks running in the background when using Final Cut Pro, including uploads to an online host. When you initiate an upload, this button becomes a central point for monitoring progress, allowing you to see how much of the upload is complete, estimated time remaining, and whether there are any issues that need addressing.

While the other options may offer useful functionalities in Final Cut Pro, they do not serve the specific purpose of showing real-time details about upload progress. For example, the Share inspector is used to manage settings related to the sharing process but does not provide updates on the task's status. Similarly, the Upload Manager and Status Tracker are not standard elements in the Final Cut Pro interface, making them less relevant in this context. The Background Tasks button effectively consolidates all task-related notifications, ensuring users are informed about uploads and other operations in progress.