You can access a large range of cloud servers types with AltaMail. eg iCloud Drive, Google Drive, OneDrive, DropBox, Box.net, MyDisk, CloudMe, Evernote, FTP, SugarSync

1. Tap on the 3 lined button in the top right of the screen to open the left side panel and tap on "Files"
2. Tap on the "Cloud Servers" icon to open the servers screen.
3. Tap on the "+" button in the top right of the screen.
4. Select the Cloud server type you wish to add
5. Depending on the cloud server type, you will be asked to login or will be taken to the cloud server app to authenticate your account.
6. After the Cloud Server account is added, you tap on the server icon to view the contents of the server.

For WebDAV server enter your user name and password as well as the URL to access the service (the URL will be available for your providers website).
For FTP enter your user name and password, you can change the port or rename FTP by tapping in the "Port" or "Name" field

Here are some sample server settings:
Box.net: URL="http://box.net/dav"
MyDisk.se: URL="https://mydisk.se/username/" Where "username" is your username. NOTE: Make sure the URL ends with "/