3
Asset fields return like an array so they can potentially have more than one item, you need to request the first item only with .one() (as opposed to requesting .all())
//First check if the asset field has more than zero items
{% if block.video.videoFileWebm|length %}
// Retrieve the first and only item in the asset field
<source src="{{ ...
2
In Craft 3 this should be:
{% if entry.images | length > 1 %}
{% set secondImage = entry.images.1 %}
{% endif %}
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