For some reason the importer seems to have skipped all attachments.
Looking at the code it seems to be a real problem fixing this afterwards as well. Since the temporary tables are removed.
Each post seems to get a new post id during the import, and the only place the connection between this new id and the file items was in the filetemp table.
Am I totally screwed here? I guess I could write a script which compares data between post tables and tries to find the new id of the post. But it seems like a bit of work.
