Changing the text of Upload/Insert on Posts and Pages Screen

function adcp_change_media_button( $context ) 
{
    // $context acutally IS 'Upload/Insert %s', so we simply drop in in some other string
    return __( 'Upload/Insert images, documents, etc %s', 'YOUR_TEXTDOMAIN' );
}
// Then use the right filter name
add_filter( 'media_buttons_context', 'adcp_change_media_button' );

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