eM Client not downloading Yahoo email attachments

eM Client 8.0.3385 (83a873c) downloads yahoo mail in IMAP, but doesn’t download the attachments until the email containing the attachment is viewed. Sync settings are checked (both boxes) to download messages for offline use and to download attachments, but it looks like it doesn’t download the pics automatically.

The purpose of using this client was to do backups of yahoo mail, but without all attachments downloaded that doesn’t work.

Going through multitudes of emails from many yahoo folders and clicking to view each one, and then waiting minutes for all photos to download, is inconvenient. Any help would be much appreciated.