We are using the Expense report template and we are having trouble with attaching receipts.

In many cases it is saying the attachments are too large.  In one case they were attempting to attach on document.  Is there a way to increase how much can be attached. 

I presume you are referring to the upload field in your form not allowing file size larger than 1024kb? If so, you can easily adjust that by following this guide: https://www.jotform.com/help/33-Changing-the-Upload-Size-Limit 

Let us know if you need more assistance on this.