Function import 

pub(crate) fn import(
    fs: &FileStore,
    store: &Store,
    list_id: &str,
    index: usize,
) -> Result<ImportReport, StoreError>

Bring source index of list list_id into this channel’s Global Memory: the entries it still lacks, each keeping its id, after the ones here. An entry already here is never overwritten; a name another entry here has is taken as <name> (<id short>).