You can add document uploading to your KennelBooker account on the 'Features & Settings' tab in the setting area, look in the 'KennelBooker Features' panel for the 'Enable Document Upload' option and turn it on!
Once enabled you will see a document upload panel on the customer and pet profiles.
Select the document type for the list, choose if you wish to keep the file private (the customer cannot see it on the online system) and then click on the [Choose File] button.
You can delete documents from the system by clicking on the [X] button beside to the document. The Uploaded By flag will denote if the document was uploaded by you with a [K] or by your customer denoted by a [C]