Being able to attach documents to transactions (eg purchase invoices and bank payments) is a really useful feature, however the fact that the maximum capacity per transaction is 2.5mb means that on recent phones and tablets if you try to attach a photo then the photo will be too big to actually attach, making it useless to a lot of people. I think the storage should be increased to at least 5mb per transaction (Xero has 10mb capacity I believe)