This action allows you to create multiple renders at once based on their tags. You can then handle each render separately with the New Render trigger.
Make sure your templates have tags applied before you set up this action. You can do so in your dashboard under "My Templates".
Most of the time, you won't need the Advanced settings. Here you can specify modifications for any property in the template's source. Find out how this is formatted by referring to the API documentation about modifications.
You can override the resolution of the render by using the scale setting. By default, this is 1.0 (100% of the template resolution). The metadata setting enables you to pass through any value, which you can then use to identify this render in a different Zap. For example, you can use the metadata in the New Render trigger to only trigger for renders with that exact value.