Is there any documentation available on how to use environment variables in Adobe Experience Manager (AEM) as a Cloud Service with OAuth Server-to-Server authentication instead of JWT?

Hello I have a problem, I don't know how to call in HTL an image that I uploaded through fileupload in a component, this is the structure of my fileupload in my cq:dialog   <fileupload       jcr:primaryType="nt:unstructured"                                                                            ...