WPMU Snapshot Pro Not Importing in Multisite Installation

I am trying to import a snapshot from a single wordpress installation in to a multisite installation. I uploaded the snapshot to the Wordpress 4.6 multisite installation by FTP. I need to import the snapshot into blog number 50. When I go to the import section, I enter the path http://mydomainname.com/wp-content/uploads/snapshots/snapshot-1473447384-160909-185624-cd3d4a1a.zip, and hit Scan/Import Snapshots, I get the following error after about 2 seconds.

PHP max_execution_time : 900s

Attempting to download remote file : http://mydomainname.com/wp-content/uploads/snapshots/snapshot-1473447384-160909-185624-cd3d4a1a.zip

Processing archive: snapshot-1473447384-160909-185624-cd3d4a1a.zip (28.09 KB)
Error: Manifest data not found in archive.
Snapshot import complete

I don't know why it says the file is 28.05 kb as it is actually about 73.1 mb in size. I have changed the file permissions to 774 to be sure it is accessible.

Can you please assist with this error?