Moving this concern from Alt text support in twurl into its own thread so it can be tracked/commented on separately from that resolved issue.
Using 1.1/media/metadata/create, alt_text can be set and retrieved for images (static and animated) but is not stored for media entities with the “video” type.
The API call to 1.1/media/metadata/create "succeed"s when tagging a media_id associated with video content, but that property comes back null when trying to consume it after the media is posted.
Ideally this will be addressed so the alt text equivalent for video content (fallback text in iframe, or use as aria-label) can be accomplished by clients according to their preferred implementation.
