Classic Attach File button and Insert as Text option in Outlook 2016 / 2019 / 2021 / Microsoft 365

Opening the File Browser dialog to attach a file has now become a 2-click process in Outlook 2016 because of the Recent Items list and the option to also attach files from Web Locations like OneDrive.

Also, on occasion I used the “Insert as Text” option to insert boilerplate text from saved files instead of attaching the file itself. It seems that this option in gone now too.

Is there any way to get back the “Attach File” button that directly opened the File Browser and had the “Insert as Text” option?