As detailed in this article, it is possible to upload manual statements for accounts that you can't connect. However, whilst it is possible to complete an Armalytix report without connecting any banks, it is advisable to contact the company that sent you the Armalytix request to confirm with them whether they will get value from an Armalytix report that does not contain any bank data, as in most cases the value of the report is driven by the bank data that we are able to collect via Open Banking.
If you have spoken to the company that sent you the request and confirmed that they would like you to proceed without connecting any banks, this article explains how to add the accounts manually.