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Drag-drop *.msg into document library: cannot open attachments. Nor copy e-mail from OWA to library.
I was glad to see that, if I first drag an e-mail from desktop Outlook to the file system, I could then drag and drop the message from the file system into a SPO document library. The operation takes...
The SPO preview of an email shows the presence of attachments but they cannot be opened without downloading the email and then using the local email client (e.g. Outlook) to open the attachment.
If you want to open the attachments in the email preview (in the browser) you will need to use 3rd party tools. These tools offer other benefits like extracting email metadata such as subject, from, .. into SharePoint columns during uploading and allow for directly attaching SharePoint documents to emails. There are several companies active in this space. See e.g. https://directory.collab365.community/office365-sharepoint/sharepoint-email-management-software/
Note: I am affiliated with one of the vendors listed
Paul | SLIM Applications
AFAIK the kind of integration you need when viewing e-mail messages in SPO is not being developed (at least I'm not aware of this)....same happens in the need to directly move / copy a message from O365 Outlook Web App to SPO