Using hash comparision to check if two files are the same
Hash value is a digital signature for each file. By comparing this signatures Air Explorer can know if the files are the same so Air Explorer in that case does not updated this file while synchronizes.
There are different hash functions and each cloud uses one of them. The hash comparison only can do with clouds that use the same hash.
-md5: local, 4shared, Google Drive, Baidu, pCloud.
-sha1: local, Box.com, OneDrive, pCloud.
-sha256: local, Mediafire.
-No hash: Hidrive, FTP, WebDAV.