This is the system Hallnus Works uses to send and receive engineering documents that cannot safely travel as email attachments.
There is nothing to sign in to here. Documents are only reachable through a link sent to a specific person, and we cannot look one up from this page.
Open the link in the email we sent you. You will be asked for your email address and then a one-time code, so that only you can open it.
Use the upload link in the request email rather than replying with attachments.