The problem with Microsoft's response (or their delegates) is that the MS engineers or decision makers cannot conceive of anyone doing anything differently than how they create the software. It is so tiresome to read Microsofties' responses that "There is no option.", "It's not set up that way.", "Why would you want to do that?" or "Here is a workaround that is a whole lot more effort, difficult, and user unfriendly." These responses are the more tiresome when Microsoft has eliminated something and the Microsofties respond as though that thing never existed (keyboard shortcuts anyone?).
Why is there no option (even if you have to activate it in Outlook Options) to Reply All with attachment?
Reply All and copy file risks forgetting to include the file.
Forward includes the file but risks forgetting recipients
Using a link to a shared file addresses the first two items, but not everyone can (or wants to) share access with people outside their organization.
Why would you want to Replay All With Attachments? So you get ALL the parties included, are sure to get the file, and don't provide a pathway to your own file storage.