Serve the original still preview for an arbitrary extension (gif, svg, jpg, pdf, ...), authorized by the share token. Mirrors the authenticated /pictures/originals/preview-files/<id>.<extension> route, which the .png-only shared route did not cover, so animated GIFs and other non-PNG originals 404'd through a share link.
GET
/shared/playlists/{token}/pictures/originals/preview-files/{preview_file_id}.{extension}
curl \
--request GET 'http://api.example.com/shared/playlists/{token}/pictures/originals/preview-files/{preview_file_id}.{extension}' \
--header "Authorization: $API_KEY"
Response examples (404)
{
"error": "string"
}