No drag & drop in windows mail? Is this correct or is something wrong?

I'm finally setting up my Win 10 updated machine. I was hoping to use Windows 10 Mail, because of its simplicity. However, there are several features missing that I use constantly. Drag & drop attachments is one. Am I correct that this feature is missing in Mail?

You can drag and drop attachments into your email messages, however this was a feature that was added in a Mail App update. Therefore, I'm wondering whether the Mail App on your PC is still on an older version? Try going to Store > Downloads and Updates and 'Check For Updates' to make sure the Mail App is on the latest version.

What's new in Mail and Calendar for Windows 10

New features in the latest update:
- Send email from Outlook.com aliases
- Open & save Calendar .ics attachments in email
- See multiple upcoming events on the wide Calendar live tile
- Drag and drop calendar events to reschedule them (PC only)
- Print Month view in Calendar
- Use Mail and Calendar on HoloLens

New features in the previous update:
- Open email messages in a new window
- View .eml attachments and save messages in .eml format
- Print Day, Multi-day, and Work Week views in Calendar

If you missed them, here are other popular features released in recent months:
- Drag and drop attachments into your email messages
- Print week view in the calendar
- Turn off the message preview text in the message list
- Get rid of junk email with right-click Move to Junk
- Let others know "I'll be late" directly from meeting notifications
- Add holidays to your calendar
- View an entire year at a glance with Year view
- Move messages to a folder of your choice with a new swipe Quick Action
- Find text within the email reading pane
- View your calendar in month view on mobile devices
- Link multiple inboxes together to view all of your email in one unified inbox
- Select and interact with many messages at once by using Select All and Shift+Select
- Right-click to empty deleted items and junk email folders