Cannot add custom fonts to a Mac for UMG

Users are unable to apply custom fonts to text in UMG. The users can place the fonts in the file location but no changes occur when trying to use other fonts (other than the default).

1. Navigate to Engine/Content/Slate/Fonts on a Mac
2. Download and unzip the attached font file
3. Place the font file in the folder containing the fonts for the engine
4. Open a project
5. Create a new widget blueprint
6. Drag a text block into the designer tab
7. Try and set the text block to use the New font
8. Notice changing the font of the text block has no effect