As an author, you can add caption files to a video or audio file that you own in Arc. The most common file type is an SRT file, though Arc also supports VTT files, which are more user-friendly for mobile devices.
If you need help creating a captioned file, you can use a captioning site such as Amara to easily create captions for your video or audio files.
To upload a caption file, click the Captions tab  then click the language for the file you want to upload .
Your uploaded caption will appear in the Manage Captions section .
To upload a caption file in a new language, click the button for that language .
View Caption Options
To view options for a caption, click the Options icon . You can download , replace , or delete  any caption file.
To toggle captions, click the Captions icon . By default, captions are off.
To turn on captions, click the name of language you want to display .