Media files can be inserted to your Pages or Posts from libraries, from local storage or from URLs.
Click on Posts → Add New in WordPress.
Click on Add Media.
You can select the files from the Media Library tab.
Information about the selected media file will be displayed on the right side of the screen under the Attachment Details. Click on Insert Post button, the image will be inserted into the post. In Attachment Details section, you will find information about the images such as URL, Title, Caption, Alt Text and Description
You can also insert an image directly from your system by clicking on Upload Files tab. Click on Insert into Post button.