Linked Smart Object is allowed for PSD category?

Hi all,
I wonder if we allow to upload a PSD file with linked smart object as we work on some projects with some agency?
It will save our time in working if we just change some small points on the linked (i.e. header.psd or banner.psd), the relevant files will show accordingly.
I mean currently, we have to embed the header/footer/common groups & layers in all PSD files in order to upload to PSD category, it make our file size big and sometime the changes are made (if any) will be implemented as a “duplicate work”.
Any idea to improve this?