Add parent Document data to generateImageName function in upload.imageSizes definitions

[dtorres-nas]

I am working on a multi-tenant solution, I've been able to isolate Upload collections using the official multi-tenant solution. I've also implemented custom file names for our blob storage by adding a prefix folder name using the related tenant ID in beforeChange. Then in afterRead I pull in the original filename for UI display and a custom CDN filename field is used for the link URL in admin.

That all works for the original image, though using a bit of a workaround. However, I'm not able to add a prefix to the saved imageSizes file names, they still get saved at the base blob storage container instead of inside the virtual folder with the original image. Looking through the docs, generateImageName seems like the exact function I need, but it doesn't provide the context I need to generate prefixed tenant filenames.

With that in mind, it would be helpful if I had access to the Document data and relations within this function, allowing customization of the filename with a tenant ID or any other logic based on the Document relationships. Thoughts?