Since WordPress 3.3, there’s only one button in the media toolbar. This is for older versions of WordPress.
Many new users to WordPress get confused by the multiple default “Upload / Insert” options. Here is an option to strip down these buttons to your needs.
This snippet replaces the output from “media_buttons_context” (all the “Upload/Insert” buttons) with just what comes after the “return” (in this case, just the image upload).
Simply paste in your