So you could change it down the road if infra/hosting changes.

Internally this is doable and Enterprise edition supports it, at the end this is stored in DBs 🙂

Also in this case, I'm uploading the data to the public file server URL, but my k8 pod can't reach that for security reasons.

Yes, this is solvable as well (again sorry for pointing it, but only in the enterprise version), where you can specify per client or globally:
` path_substitution = [
# Replace registered links with local prefixes,
# Solve mapping issues, and allow for external resource caching.

        # {
        #     registered_prefix = " ` ` "
        #     local_prefix = "file:///mnt/shared/bucket/research
        # },
        # {
        #     registered_prefix = "file:///mnt/shared/folder/"
        #     local_prefix = "file:///home/user/shared/folder"
        # }
    ] `Wdyt?