Air Explorer supports the best cloud servers: OneDrive, OneDrive for Business, Google Drive, Amazon Cloud Drive, 4shared, Box, Dropbox, Mega, Mediafire, Yandex, Baidu, Naver, Hidrive, pCloud, Mail.ru, Mail.com, Adrive, Magenta Cloud, Stack Storage and Datto Drive.

Moreover, Air Explorer works with FTP, FTPS and SFTP accounts. They are commly used to acces servers in Internet like web servers or WordPress installations.

You can add these accounts like a cloud. Open the add account panel and select the FTP or SFTP logo and fill the server, user, password,etc.

You can check more information here:
-WebDav in Air Explorer
-SFTP in Air Explorer