from osf.models.base import generate_object_id


def copy_files(src, target_node, parent=None, name=None):
    """Copy the files from src to the target node
    :param Folder src: The source to copy children from
    :param Node target_node: The node to copy files to
    :param Folder parent: The parent of to attach the clone of src to, if applicable
    """
    assert not parent or not parent.is_file, 'Parent must be a folder'

    cloned = src.clone()
    cloned.parent = parent
    cloned.target = target_node
    cloned.name = name or cloned.name
    cloned.copied_from = src

    cloned.save()

    if src.is_file and src.versions.exists():
        fileversions = src.versions.select_related('region').order_by('-created')
        most_recent_fileversion = fileversions.first()
        if most_recent_fileversion.region != target_node.osfstorage_region:
            # add all original version except the most recent
            cloned.versions.add(*fileversions[1:])
            # setting the id to None and calling save generates a new object
            most_recent_fileversion.id = None
            most_recent_fileversion._id = generate_object_id()
            most_recent_fileversion.region = target_node.osfstorage_region
            most_recent_fileversion.save()
            cloned.versions.add(most_recent_fileversion)
        else:
            cloned.versions.add(*src.versions.all())
    if not src.is_file:
        for child in src.children:
            copy_files(child, target_node, parent=cloned)

    return cloned


def copy_files(src, target_node, parent=None, name=None):
    """Copy the files from src to the target node
    :param Folder src: The source to copy children from
    :param Node target_node: The node to copy files to
    :param Folder parent: The parent of to attach the clone of src to, if applicable
    """
    assert not parent or not parent.is_file, 'Parent must be a folder'

    cloned = src.clone()
    cloned.parent = parent
    cloned.target = target_node
    cloned.name = name or cloned.name
    cloned.copied_from = src

    cloned.save()

    if src.is_file and src.versions.exists():
        fileversions = src.versions.select_related('region').order_by('-created')
        most_recent_fileversion = fileversions.first()
        if most_recent_fileversion.region != target_node.osfstorage_region:
            # add all original version except the most recent
            cloned.versions.add(*fileversions[1:])
            # create a new most recent version and update the region before adding
            new_fileversion = most_recent_fileversion.clone()
            new_fileversion.region = target_node.osfstorage_region
            new_fileversion.save()
            cloned.versions.add(new_fileversion)
        else:
            cloned.versions.add(*src.versions.all())
    if not src.is_file:
        for child in src.children:
            copy_files(child, target_node, parent=cloned)

    return cloned

Use clone() method from BaseModel to copy most recent fileversion
Use clone() method from BaseModel to copy most recent fileversion
