When using highlighted content, allow the name of the file to be displayed instead of something like "PowerPoint Presentation". It makes it nearly impossible to tell what the document is for when there is a group of "PowerPoint Presentation"s being shown in the highlighted content
Colleen Parker commented
For PowerPoint the default Title is "PowerPoint Presentation" so that is very common. I'm with Eric on this, expose your Title column in your library and use good Titles.
I know this is old but in case someone else comes across this. Check your document library name and title fields. If Title field exists, it will use this column. If this field is empty, it uses the Name field. It's likely that you need to clear or edit the "Title" fields.