POST Video Stories using graph api facebook

hello guys im trying to automate a stories video post on facebook but dont know what im doing wrong, my picture stories function works fine but my video one is not working at all!!! i tried to look over here and documentation for a answer but couldnt find a solution! in the first 10 calls i was getting errors from graph and from now on i keep getting erro 500! does anyone knows what i can be doing wrong?

    function postStoriesVideoFacebook($fb, $pageId, $pageAccessToken, $mediaUrls){         $mediaUrls = 'https://sample-videos.com/video123/mp4/720/big_buck_bunny_720p_1mb.mp4';        // Etapa 1: Inicializar a sessão de upload        $response = $fb->post("/{$pageId}/video_stories", [         'upload_phase' => 'start',     ], $pageAccessToken);     $initData = $response->getDecodedBody();     $videoId = $initData['video_id'];     $uploadUrl = $initData['upload_url'];     // Debugging - Verificando as variáveis     var_dump($initData, $videoId, $uploadUrl);     // Etapa 2: Fazer upload do vídeo usando a URL remota     $ch = curl_init();     curl_setopt($ch, CURLOPT_URL, $uploadUrl);     curl_setopt($ch, CURLOPT_POST, true);     curl_setopt($ch, CURLOPT_HTTPHEADER, [         "Authorization: OAuth $pageAccessToken", // Passando o token como OAuth         "file_url: $mediaUrls"     ]);     curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);     $uploadResponse = curl_exec($ch);     curl_close($ch);     $uploadData = json_decode($uploadResponse, true);     // Debugging - Verificando a resposta do upload     var_dump($uploadData);     if (isset($uploadData['success']) && $uploadData['success'] === true) {         // Etapa 3: Publicar o vídeo nos Stories         $finishResponse = $fb->post("/{$pageId}/video_stories", [             'upload_phase' => 'finish',             'video_id' => $videoId,         ], $pageAccessToken);         $result = $finishResponse->getDecodedBody();         // Debugging - Verificando a resposta da publicação         var_dump($result);         if (isset($result['success']) && $result['success'] === true) {             return $result['post_id']; // Retorna o ID do post se a publicação for bem-sucedida         } else {             throw new Exception('Erro ao publicar o vídeo nos Stories.');         }     } else {         throw new Exception('Erro ao fazer upload do vídeo.');     } } 

forums , using direct the cURL options, postman etc