You can use the Gmail app on your android device to send and receive emails and an attachment file also. You can easily save that attachment on your device’s storage. If you can’t save photos from Gmail, then reload the webpage and also check the internet connection is good. If you still unable to do the same, then move towards and speak to a live person at Google to resolve it. https://www.numbersupportcustomerservice.com/gmail-customer-service/