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Try this:

echo pods_image( $pod->field( 'your_file_field' ), 'thumbnail' );

Thanks for your reply. However, this does not work with my Pod Page / Pod Template setup. Its about your code above.

My Pod Page:

<?php
$pods->find();

echo $pods->template('categorie_block');
while($pods->fetch()){
    echo $pods->template('categorie_block');
}
?>

Pastebin Variant: https://pastebin.com/r8UQWSns

My Pod Template ‘categorie_block’:

<div class="categorie-block-wrapper">
	<div class="categorie-block">
        <h2>{@naam}</h2>
        <img border="0" src="<?php echo pods_image( $pods->field('afbeelding'), 'thumbnail' ); ?>" width="100" height="100"/> // does not work
    </div>
</div>

PasteBin variant: https://pastebin.com/naxLd8GR
Of course I have tried different combinations:
echo pods_image( $pod->field(‘afbeelding’), ‘thumbnail’ );
echo pods_image( ‘afbeelding’, ‘thumbnail’ );
echo pods_image( ‘{afbeelding}’, ‘thumbnail’ );

Btw: About this Pod Page and Pod Template combination is this bug report on Github: https://github.com/pods-framework/pods/issues/1244

Ah, I have found it with get_definded_vars().

I can use the $obj variable.

So my Pod Template code changes to:

<div class="categorie-block-wrapper">
	<div class="categorie-block">
        <h2>{@naam}</h2>
        <?php echo pods_image( $obj->field('afbeelding'), 'thumbnail' ); // WORKS ?>
    </div>
</div>