The convertor system has two main attachment related functions:

• import_attachment_files()
• import_attachment()

The first one was sort of updated. It now reads the storage\attachment\config\path config field, but still assumes attachments are to be stored on the local disk and just calls copy_dir().

The second function either assumes the first is called to update $config or was missed as it directly uses $config['upload_path']. Like the first, this also does not use the storage system and just calls copy_file().