Use Publish Now when the post should be submitted to the selected social channels immediately rather than placed into the future scheduling queue.
The Publishing Options section includes:
Select Publish Now for immediate publishing.
The Composer prevents publishing when no account has been selected. It can display Please select at least one account.
The Composer also requires usable post content. If no caption, media, or eligible Story text is available, it can display Please add a caption or media to your post.
Before the publishing request is submitted, the interface can display Preparing secure media transfer.... This allows the system to prepare stored Media Library attachments and external media URLs for the publishing service.
During submission, the interface can display Publishing to social networks.... When the request starts successfully, the user can receive Publishing has started!.
For immediate publishing, the Composer routes back toward Social Activity. Use Social Activity to review the publishing status and determine whether each resulting post completed successfully.
The interface can display Failed to publish content or a more specific provider message. Review the selected channel, content type, media requirements, and connection state before trying again.