No, because the documents were encrypted on your device before being sent to Sejf Życia. All an administrator could see is a string of meaningless characters that is practically impossible to decrypt (it would take billions of years - to date no successful attempt to break the encryption algorithm we use has been documented).
Put your most important documents in one secure place
Sejf Życia is an encrypted space for documents, access details and instructions for loved ones. Only you decide who gets access, and when.