Do you need to copy documents from variation source site to other variation sites.
Can it be an Automatic copy of docs?
Yes, provided the following condition is met i.e.
If the URL to the document is in Publishing URL field on Page Layout,
on creating a new page using this Page Layout, add a link to the document and save.
Approve the workflow and magic happens - The document also gets copied to all variation sites from this source variation.
Same is true for Images from Image Library.
Unfortunately List Items will not get copied automatically and we will need custom code to do that.