raz921992

@lutheradams I have the latest version but as @arnaudbroes said I think we have another scenario here that could happen.

@arnaudbroes thank you for response!

Great, thank you!

Hello, I have the same problem. Still have this problem.

Yes this is also a problem but the content-type needs to be a general format(application/json). I read multiple topics on internet and I managed to do it right.

This is the good version of how to create a post with WP API add feature image and one image on gallery:

//connection to wordpress api
        $username = 'user';
        $password = 'password';
        $client = new Client([
            'base_uri' => 'https://www.localhost/wp-json/wp/v2/',
            'headers' => [
                'Authorization' => 'Basic ' . base64_encode($username . ':' . $password),
                'Accept' => 'application/json',
                'Content-type' => 'application/json',
                'Content-Disposition' => 'attachment',
            ]
        ]);
        $this->createCategoriesIfNotExist($client);
        // uploading featured image to wordpress media and getting id
        $imageOnMedia = $client->post(
            'media',
            [
                'multipart' => [
                    [
                        'name' => 'file',
                        'contents' => file_get_contents($data['imageUrl']),
                        'filename' => $data['fileName'],
                    ],
            ],
            'query' => [
                'status' => 'publish',
                'title' => $data['originalFileName'],
                'comment_status' => 'closed',
                'ping_status' => 'closed',
                'alt_text' => $data['fileName'],
                'description' => '',
                'caption' => '',
    		],
        ]);
        $media = json_decode($imageOnMedia->getBody(), true);
        $categoryId = $client->get('categories', ['query' => ['slug' => $data['deviceCategory']]]);
        if(!empty($categoryId)) {
            $wpcategory = json_decode($categoryId->getBody());
        } else {
            $wpcategory = 1;
        }

        $mediaStructure = '<!-- wp:gallery {"ids":['.$media['id'].'],"imageCrop":false,"linkTo":"attachment"} -->
        <figure class="wp-block-gallery columns-1"><ul class="blocks-gallery-grid"><li class="blocks-gallery-item"><figure><a href="'.$media['link'].'"><img src="'.$media['source_url'].'" alt="werwerwer-1574671862.jpg" data-id="'.$media['id'].'" data-full-url="'.$media['source_url'].'" data-link="'.$media['link'].'" class="wp-image-'.$media['id'].'"/></a></figure></li></ul></figure>
        <!-- /wp:gallery -->';

		// uploading post to wordpress with featured image id
        $post = $client->post(
            'posts', 
            [
            'multipart' => [
                [
                    'name' => 'title',
                    'contents' => $data['postTitle'],
                ],
                [
                    'name' => 'content',
                    'contents' => $mediaStructure
                ],
                [
                    'name' => 'featured_media',
                    'contents' => $media['id']
                ],
            ],
            'query' => [
                'status' => 'publish',
                'categories' => [$wpcategory[0]->id]
    		]
        ]);          

Thank you @anant101289 for your reply!

Please delete this topic message. I made a mistake it’s not the right topic. Sorry!