Click into the invoice > go to the invoice preview window > find the '...' button > 'Download docx'
The docx version of the invoice will be downloaded. From here, add the additional notes or details required and save.
Back in Synergy, go to the invoice > invoice preview window > '...' > 'Upload docx'.
Navigate to the newly edited invoice docx and save. The preview window will generate a new document as a PDF.
If the invoice was edited incorrectly, you can roll back the changes by going to the invoice preview window > '...' > 'Versions'