Symptom
You are seeing the below error message after trying to publish an invoice.
Invoice (DOC ID xxx) has been published to your accounting software but attachment could not be uploaded; please manually attach document in accounting software.
Cause
This error is due to limitations within your accounts package relating to the file size that can be attached externally. For instance, Sage Accounting will only allow you to attach files that are no larger than 2.5MB, and Xero will only allow 3MB.
Please note
Xero Cashbook and Ledger integrated companies have an API limitation wherein you cannot post invoice attachments from external software. If your company is integrated with this package, you will always need to post invoice images there manually.
Resolution
To clear this error, you would need to save the invoice image to your PC, and manually attach it to the transaction in your accounts package.
To download the invoice image, simply click to view your invoice from your Inbox as shown below.
You will then need to select the PDF download button on the bottom right corner of that screen.