As per communication in support ticket with Veeva support team, currently the preview link looks like file:/// in iPad for Fragment contents used by Approved Email is not working as preview contents are located in Vault and not downloaded to each iPad. The file:/// URL makes no sense to users and always fail to preview. It is not limited to the fragment but also other vault contents. It is a defect of the product we believe. So we recommend to enhance the preview feature for content preview in iPad Veeva. The reference link in Fragment in iPad should be directed to Vault server, not local drive like file:/// . So users still could preview the contents before sending to the HCPs.