This worked for me:
function uploader_text() {
?>
<p class="upload-html-bypass hide-if-no-js">
<?php _e('mytext here'); ?>
</p>
<?php
}
remove_action('post-html-upload-ui', 'media_upload_html_bypass');
add_action('post-html-upload-ui', 'uploader_text');
You tried to do “remove_action” after the action already happened. That was the bug.
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