If you go to your SSL Dragon account, then to your SSL Certificate details page, you will find the 3 large pieces of codes that your SSL Certificate is made of:
1) The CSR code is the one which you generated along with your Private Key, and which you used to configure your SSL Certificate.
2) The CRT code which is your actual SSL Certificate code.
3) The CA Bundle code contains the root and intermediate certificates in it.
Also, if you need more root and intermediate certificates for Comodo/Sectigo, you can find them all at this link.