socialfeed-instagram-post-image.html.twig in Social Feed 8

{% if post.media_url %}
  {% set alt = post.raw.caption ? post.raw.caption[:50] ~ (post.raw.caption|length > 50 ? '...') : '' %}
  {% if post.post_url %}
    <a href="{{ post.post_url }}">
      <img src="{{ post.media_url }}" alt="{{ alt }}"/>
    </a>
  {% else %}
    <img src="{{ post.media_url }}" alt="{{ alt }}"/>
  {% endif %}
{% endif %}