API - vertical_thumbnail_url

New video field: vertical_thumbnail_url

Added support for the vertical_thumbnail_url field as part of the dual thumbnail experience. It allows setting a portrait-oriented thumbnail for a video, independently from the existing landscape thumbnail_url.

• Type: url
• Read access: Public
• Write access: Requires a CDN-uploaded image URL
• Resized variants are available via vertical_thumbnail_60_url through vertical_thumbnail_1080_url
• The portrait thumbnail is served in vertical player contexts. The landscape thumbnail (thumbnail_url) continues to be used in standard 16:9 contexts

See the full reference for Video fields.