If a Collaborate session has been conducted in the "new" Collaborate, also called Collaborate Ultra the steps to view a recording are a little different from recordings in the "old" version. If the screen you're looking at doesn't look like the one below you probably need to use this article instead.
If your screen looks like this one, to view a recording, click the three lines in the top left corner (known as a hamburger menu), then click on Menu.
Click on Recordings
You can now choose from watch now or download the file as an MP4 to watch offline.