Hello there, 
I am working on a project where I need to integrate Shotstacks video editing capabilities into my application. While I have gone through the documentation, I’m still encountering a few challenges that I could really use some help with.
I am using the Shotstack API to automate video generation, and my app is built on a Node.js backend. The main issue I am facing is with understanding how to properly structure the request body when sending a video template with dynamic content. Specificall; I am trying to insert user uploaded images and text into a template, but I am not entirely sure how to reference the uploaded files within the API call.
What is the best way to dynamically insert user content into a predefined video template using Shotstack? 
How can I apply custom transitions or effects to specific segments of the video?
Also, I have gone through this post; https://community.shotstack.io/t/how-to-optimize-video-rendering-workflows-using-shotstack-api-aws-devops which definitely helped me out a lot.
Are there any common pitfalls or best practices when integrating the Shotstack API into a Node.js environment that I should be aware of?
Thank you in advance for your help and assistance. 