html force files to download (not open in browser)

I want the music link to be downloaded

But all phone browsers open it and play it inside

Used the download tag but still failed

 <a title=" dowload music " href="<?php echo get_field("post_link_low") ?>" download="true">
  <img width="20px" height="20px" src="/wp-content/uploads/2018/05/dowload.png" alt=" dowload music">
  dowload music
</a>