I would like to insert a php code, but the error when placing

**Shortcode generated by theme**

```
[col_grid span="4" span__sm="14" height="1-2" visibility="show-for-medium"]

[ux_banner height="500px" bg="***[banner-picture]***" bg_size="original"]

[text_box width="100" scale="148" position_x="50" position_y="100" bg="rgb(88, 32, 123)"]

[ux_text text_color="rgb(247, 128, 44)" class="uppercase"]

<p><strong>preencha a proposta de adesão</strong></p>
[/ux_text]

[/text_box]

[/ux_banner]

[/col_grid]

```

---

**My PHP CODE**

```
add_action('foto_banner', 10 );

function foto_banner() { ?>
<?php if(get_field('foto_banner')) { ?>

<?php the_field('foto_banner'); ?>

<?php }else{
    echo "Texto não informado";
}
}

add_shortcode( 'banner-picture', 'foto_banner');

```