Add media button is missing from WordPress. There is no built-in way to add media files to a post or page.
You must use a 3rd party plugin or use a manual method.
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In WordPress, the “add new post” button is located in the “Posts” menu. To add a new post, click on the “add new post” button, and then fill out the form with your post information. You will need to provide a title, body, and slug.
If you are new to WordPress, you may be wondering where to add actions in your blog. Actions are little programs that help you automate tasks in your blog. There are a few different ways to add actions in WordPress:
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WordPress 4.5 introduced a new post button on the front-end of the site. This button replaces the old publish button, and it allows you to quickly publish new posts or pages. Where Is the New Post Button on WordPress?