Emailing macOS Files from Windows
If your primary email application is in Windows, you can still easily attach files from your macOS folders. Here is how to achieve that:
Note: This functionality requires the installation of Parallels Tools.
Right-click the file in macOS and select Share > More. This opens the Extensions section of the macOS System Settings.
Scroll down the list of extensions and select Send with Windows Email App (you have to do this only once).
Right-click the photo again and select Share > Send with Windows Email App. The default email application starts in Windows, creating a new message with the file attached. You only need to enter the recipient's email address and email subject.