What does the 'upload' icon on YouTube allow users to do?

The 'upload' icon on YouTube is specifically designed to initiate the process of uploading videos to the platform. When a user clicks on this icon, they are prompted to select a video file from their device to share on their channel. This function is essential for content creation, as it facilitates the transition of a video file from the user's local storage to YouTube's servers, thus allowing the video to be processed, published, and made available for viewers.

The other options refer to functionality that does not directly involve the act of uploading a video. Editing video length typically occurs during post-production with editing software before upload. Adding audio tracks is also a pre-upload function and often requires editing software or may be done within the YouTube Video Editor after uploading. Accessing video analytics is a feature available after a video has been uploaded and published, allowing creators to analyze viewership data, but not part of the upload process itself.