Hide ACF fields in the front-end when one of them is empty

Question

I am currently trying to show fields in the front-end, however they're files/uploads. So they're not always used. I am trying to work out how you hide fields when there is no upload. I currently have this code after researching some bits, but it isn't working. I do apologise, I am currently still learning PHP.

Any help would be greatly appreciated.

function woo_new_tab_content() {


   // The new tab content
   if (get_field ('tech_sheet'));
   echo '<h3><a href="'. get_field('tech_sheet') .'" target="_blank">Download Tech Sheet</a></h3>';
   if (get_field ('datasheet'));
   echo '<h3><a href="'. get_field('datasheet') .'" target="_blank">Download Datasheet</a></h3>';
   if (get_field ('datasheet_2'));
       echo '<h3><a href="'. get_field('datasheet_2') .'" target="_blank">Download Datasheet</a></h3>';
       if (get_field ('datasheet_3'));
   echo '<h3><a href="'. get_field('datasheet_3') .'" target="_blank">Download Datasheet</a></h3>';


       }