YouTube, Facebook and Vimeo
YouTube, Facebook and Vimeo support closed captioning, so open captioning is not necessary. However, remember to edit the closed caption file before publishing and promoting your video. Auto-generated caption files often contain misspellings and errors. In fact, auto-generated caption files supplied by YouTube and others are not considered viable according to the Department of Justice for compliance with ADA.
You may upload your video to YouTube, correct your captions within the platform, and download an .SRT file. When uploading the same video to Facebook, upload the .SRT file to easily correct captions and avoid duplicate effort. Facebook auto-plays all videos with the sound turned off, so open captioning is a best practice for higher post engagement.