When uploading a file for VDP / Asset / Upload Sets Quantity, why is the page count not changing?

PRESSERO > *Pressero FAQs
If you are using the VDP/Asset/Upload Sets Quantity option for a product and have a quantity field for a product set to automatically use a page count from and uploaded file, the following file types are supported: ".csv", ".xls", ".xlsx", ".pdf", ".ai",".eps".  While ".ai" and ".eps" files are supported, these will only be utilized if they are PDF compatible..

If other file types are uploaded, the page counts may not automatically be determined using this feature.