Fetches the explicitly-set thumbnail customizations (still image URL, alt text, fit strategy, and the looping video thumbnail / text-overlay plugins) for the video.

Requires api token with one of the following permissions

Read all folder and media data

Tokens with the "Act with a team member's permissions" permission (all:delegate_to_contact_permissions scope) can also be used. Requests made with such a token are authorized using the permissions of the contact assigned to the token.

An expiring access token created with the all:delegate_to_contact_permissions scope and an authorization for this media can also be used; any permission granted on the media allows reading its customizations.