we are using the Box API to download representations of files uploaded to Box. We noticed that upon upload of a new PPTX file, the preview thumbnail was not yet present in the representations list. After some time, the thumbnail was there.
It seems the thumbnail has not yet been generated at the beginning. Is that right? When are the thumbnails for PPTX generated? Upon uploading, or upon first viewing the file?
Also: is there some event or logic that tells us that the representations are now ready? How can we differ between the case a) thumbnails are not there because not supported and b) thumbnails are not there because they have not yet been generated.