Related documents can be attached to the share register when it is created and afterwards. All information and related documents are in the share register under “Company information”.
Firstly, go to "Shareholder Register" in the left menu. Then click on the tab "Company information" and the button "Edit company information".
Then scroll down to the “Documents” heading. Click on the box or drag and drop files to the box to upload documents. Finish by clicking the "Save" button.