Scan to email not working 5520

I have scanned to email with no previous problems the file has simply been attached to the bottom of the email...However now, I am scanning the documents which on the printer is saying is working fine (scanned and sent) however on receiving the email there is a file attached named "filename-1" and I am unable to open the file within the mail on my iPad

Please help this has been causing me lots of problems today! Many thanks!