Copilot Does Not Summarise Slides in Powerpoint

I have a 40 slide presentation. Some of the slides are particularly wordy, so what I was planning to do was to ask Copilot to summarise a series of slides and add that as a companion document to the presentation.

When I ask it to summarise a single slide by asking it to "Summarise slide 5" it grabs a title from a previous headline slide and creates a summary based seemingly on the whole presentation. If I ask it to summarise multiple slides with "Please summarise slides 5, 7, 10...." It creates a headline for each slide but summarises the wrong slides throughout and places the wrong titles on each slide in the response.

Anyone else tried summarising specific slides in a presentation?