Sometimes, the Cloud Printing service from Google may not function as it should. Some issues that may come up are that the print job that you send to the cloud does not reach the printer or the task reaches the printer, yet it doesn't print a copy of the file. One reason for this is that the printer is offline. When the printer is back online, it will download the file and print the copy.
Another reason the printer may not print is that the password authentication failed. This deals with the 2-step verification process associated with Google Accounts, and it is a concern for standard printers that are connected to a computer that uses the Google Cloud Print Connector. If you use this, a separate application-specific password is required for Google Cloud Print. The standard Google Accounts password may not work. To generate an application-specific password for Google Cloud Print, go to the Authorizing Applications and Sites page in your Google Account.
Other issues involve unsupported file types. This usually returns an error message when you try to print to an HP ePrint-enabled printer. The file types that are compatible with ePrint include text files (.txt), PDF files, HTML files, Microsoft Word (.doc and .docx), Microsoft PowerPoint (.ppt and .pptx), Microsoft Excel (.xls and .xlsx), and Image files (.bmp, .gif, .jpg, .png, and .tiff).
One more item to check is the firmware of the printer. If it is outdated and there is a newer version of the firmware, update the software before printing. Most HP ePrint-enabled printers can be updated from the control panel.