This app allows you to send mail with attachment files through Gmail directly. 
It supports Dropbox, MS OneDrive, Box.com, Facebook Photo/Video, Instagram Photo/Video, Flickr, Pixabay Free Image, 500px, Gfycat Animated GIFs, Imgur, Google Cloud Storage, OpenDrive, MediaFire, Yandex Disk.

It is a easy-to-use solution to send email messages with your Cloud files.

You can choose multiple files directly from Dropbox, OneDrive, Box.com, and more.
This app only works locally without going through the server. Your files and mails are completely safe, guarantees privacy. Provides connect with Google Drive. You can directly open this app with multiple Google(Gmail) accounts.