Here are two examples using the pre-upload-ui
and post-upload-ui
hooks:
add_action( 'pre-upload-ui', function() {
?><h4>
<?php esc_html_e( 'Please Remember This And That! (pre-upload-ui)', 'wpse' );?>
</h4>
<?php
});
add_action( 'post-upload-ui', function() {
?><h4>
<?php esc_html_e( 'Please Remember This And That! (post-upload-ui)', 'wpse' );?>
</h4>
<?php
});
You might want to adjust this further to follow the Admin UI style.
This will show up as:
and
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