I have some custom webpart that uses the SharePoint Online Search. By $selecting the managed property FileType/FileExtension, I can see the extension of the search results:
(screenshot from Search Query Tool)
If a have two PowerPoint files, one has .pptx and one .ppt file extension, these are two different values in the refiners. So, I cannot search for "All PowerPoint files".
Is there any way to reach this goal?
BR