I have previously successfully send invoices with attached documents, as recent as last week. There are no other error message. The error message shows up when I try to save the invoice with documents attached. It shows the document has uploaded 100% but the tickbox to select it to attach to the invoice when it is emailed doesn't appear. I've saved the invoice and went back into it and tried as well. No matter which way I try, I keep getting the same error message. Any help/guidance would be appreciated.