Hope you're keeping well! It's that time when I go through revamping my sites again! (Did I hear you groan ;) )
I'm adding a webgains feed.
Using Setup > Automation Tool.
Fetched a url from webgains for a pipe deliminated csv feed, not zipped
Entered it into the url and clicked Save and Run
It imports an empty file.
I downloaded the feed using same url to my desktop and it is definitely correct and produces a full csv.