When people would try to send me attachments, pictures specifically, it would show the download button and constantly say that I was unable to download the attachment. I had Wi-Fi on at the time so after turning it off, it finally worked and I was able to receive/download it. A small issue that I don't mind too much since I don't really receive many attachments frequently, but would still be nice if addressed in a future update as I don't think it would be too hard to fix.