You can add files to your quote before you send it and after you sent it.
Adding files and images after sending a quote
To add files and photos once you have sent out a quote you will have to edit the original quote.
If you go back to the original quote you sent, at the top left you should see a button called 'Edit Quote':
Click on the button and add any extra files or images.
Just let the organiser know you've done this!