Could not download multiple attachments in OO

We are using Operation Orchestration 2018.12

In order to get mails coming from external customers, we created an OO flow searching for mails in INBOX folder. It checks INBOX folder with a specified intervals and creates a ticket for SMAX via this mail if any e-mail exist . We are using Get Mail Attachment operation in OO in order to download attachments. However, we have a problem with multiple mail attachments. OO does not allow to download multiple attachments.

Is there a known procedure for downloading multiple attachments ?