May I suggest to copy/move the email to multiple paths in SharePoint. This means we can choose multiple paths in one go.
AdminSupport (Admin, OnePlace Solutions) commented
Thank you for your comment.
We do not currently support or recommend saving the same email to multiple locations in SharePoint due to data redundancy concerns. For example, if a user modifies the email item in one location, and it is not modified in the other locations where the email is stored, this can lead to data inconsistency.
Storing an email in more than one SharePoint location is therefore something our users do not wish to do. Hence why this functionality has not been added within OnePlaceMail for Desktop and the OnePlaceMail App.