The new and smart file details card is coming to SharePoint Online (SPO) and OneDrive For Business (ODFB) adding new intelligent features such as the reading time (Note: For now I have only seen this feature in Word documents) or the details about the last users accessing the files no matter if they are corporate or external users:
The file details card also allows to add a descriptive text for the file by using the “Edit at a glance” link:
Once the user click that link, a side panel shows up so the text can be added:
When the text is added and saved, I assume is going to be presented to the user in the file card in some way…but at the time of writing this post, the “Edit at a glance” feature was not working so no matter the text you added, you were not able to save it.