My employer is running a legacy version of Business Central (On-Prem) - Spring '19 Release. When he opens a Purchase Order and selects Print/Send -> Send and then at the first dialog titled: 'Edit - Send Document to' sets Email to 'Yes (Prompt for settings)' and clicks OK, he is then presented with this 'Send Email' dialog:-

When I do the same on the Cloud Sandbox, I get the dialog below (Page: 13 Email Editor):-
This dialog allows the user to add extra attachments (exactly what my employer is looking for).
When did this functionality change (what version)?
Can my employer's legacy version be configured to use this new dialog?