To use After Effect templates with Shotstack you first need to convert these into Shotstack templates. If you are looking for a solution that directly automates your After Effect templates, we recommend looking for an alternative solution.
Importing an After Effects Composition
You can import an After Effects composition by using the After Effects plugin. This plugin will allow you to export your After Effects composition and create a template using the same structure as your After Effects composition.
As Shotstack is not a motion graphics service we only support a limited subset of features. You will have to adapt the template to work within Shotstack's feature set.