I have something similar with Excel attachments: sometimes the preview shows, sometimes it doesn’t. But when it doesn’t, it shows a picture of a blank document with the word ‘Document’ on top, no Excel icon (like in de post about the PDF attachment)....

I have created a database with companies that have offered internship positions to our students in the past + reviews of these companies by students and internship coaches. Students that are looking for an internship position can browse the database...