Step 3: Find and select the video file you want to upload and click “Open”.
While the video is uploading, you can add a comment about the video, give your video a title, choose keywords, and add it to a playlist.
Under the “Thumbnail” tab on the right, you can choose a thumbnail image for your video. You can choose one of Facebook’s auto-generated thumbnail images, upload your own custom image, or select any frame from the video.
Under the “Subtitles & Captions” tab you can upload an SRT file for closed captioning. Facebook does not do automatic captioning so you will need to upload your own SRT caption file if you want closed captioning to be available on your video.