Trouble with Media Framework Quick Start (UE 4.27)

Hi, I’m trying to do the following Media Framework Quick Start tutorial for UE 4.27 but I’m encountering some trouble.

In Step 2 of section 1 - Project and Material Setup, it seems to show that four assets should appear after importing the provided Sample Content, but I’m only seeing the File Media Source asset. The Sample Content folder only includes an .mp4 file.
Does anyone have an idea what I may be doing wrong, or how to proceed without the other assets?