The closest I found was this - https://medium.com/@bsaravanaprakash/how-we-migrated-a-million-assets-into-aem-cloud-service-dam-ef7eb74d30fa (hope you can use some of it for AEM on-premise as well since this is mostly cloud)

Thanks @giuseppebag for the quick response.Do note that this folder creation is happening from an Azure Function being managed by an external team. They are using the REST APIs to do all these operations and using the aem-upload library. I am not sure how ACS can help this use case unless we customi...

@GiriBabu I believe further customization is needed to enable .psd to be shown on the webpage for .psd files since the above config only allows to select a .psd but not render it? Can you please confirm ?

Hmm tried few items as suggested but it still did not work Copied the default and deleted all the other tabs and put a reference of granite:include to libs path per your post above. The copy is created under /conf/global/settings/dam/adminui-extension/metadataschema/default-copy-custom( I deleted th...