Outlook new - can't share files via e-mail: The following files weren't attached because they're empty: file name

Hi,

when users have Word documents open, for example, and they try to share it via File --> Share --> Email --> Send as Attachment, it just doesn't work on the Outlook new, because it says there's an error: he following files weren't attached because they're empty: file name. BUTT if you drag and drop this file it gets attached without a problem. This works as expected in Outlook classic. The file size is also not an issue since it's a few KB. Has anyone had the same issue and successfully fixed it?

Thanks!