Gmail gives the feature of attaching files that can be of various formats and therefore you’re able to send the message containing documents of different formats like .doc, .pdf, etc. So if you’re not able to attach files and therefore want to contact Gmail number, then you need to go to the vicinity of WiFi router and refresh the web page. The attach file feature will start working fine. https://outlookcustomerservice.com/gmail-customer-service-phone-number/