From your Orchestra dashboard, click the 'Share Register' and 'Shareholders' section. By default, all shareholders/members will be shown, and you can filter these by their name or email and then enter the 'View as on date'.
Click on the statement of holding icon for the selected shareholder/member, and this will generate a pdf statement of the shareholdings at that date.
For example, the first statement of holding below is for Katherine Chapman on today's date, and the second is her statement of holding as at 31st March 2020 showing the shares that she had at that time:
As at today:
As at 31st March 2020:
The statement of holding includes the name of the company, the class of shares held by the shareholder/member, and the number of shares held by them, so covers the requirements for a share certificate for investors.
The official legal record of investor shareholdings is the entry on the Share Register of the company. If there are any inconsistencies between the Statement of Holding and the company’s Share Register, then the register will prevail.