This information is from the Canvas Community. View the original post here
You can generate or upload caption files to a video or audio files that you can edit in Canvas Studio. The most common file type is an SRT file, though Studio 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.
Locate Media
In your Studio account, locate the media you want to view. You can view your uploaded media on the My Library page [1], or search for the media in the search field [2].
Open Media
Hover over the media and click the Play image.
Add Captions
To generate or upload captions, click the Captions tab.
Generate Captions
To automatically generate captions for your media, choose the spoken language [1] and click the Request button [2].
View Captions
After your caption file has been queued and processed, your generated caption file will appear in the Manage Captions section.
View Caption Options
To view more options for the caption file, click the Options icon [1]. To review and publish the captions, click the Edit link [2]. When you are editing the auto-generated caption file, the media file will automatically pause until you click the next timestamp.
You can also download [3], replace [4], or delete [5] any caption file.
Review and Publish Captions
Review the generated caption file and click the Publish button. Any additional changes made to the caption file after it is published will be saved automatically.
Upload Captions
To upload a caption file, click the language button for the caption file you want to upload [1].
To upload a custom caption file, click the Show More link [2].
Upload Custom Captions
Click the Custom button.
Enter the name of the language [1] and click the Submit button [2].
Select File
Locate and select the file on your computer [1]. Click the Choose or Open button [2].
View Captions
Your caption file will appear in the Manage Captions section [1]. To upload a caption file for another language, click the language button for that language [2].
View Caption Options
To view options for a caption file, click the Options icon [1]. You can download [2], replace [3], or delete [4] any caption file.
Enable Captions
To toggle captions in your media, click the Captions icon [1]. By default, captions are off.
To select a language, click the language you want to view [2].