Some Google services (Gmail, Drive, Docs, Meet, Groups, Chat, Keep and Voice) went out of business on Thursday morning, according to G Suite status control panel the company's. At the moment, according to the company, all Gmail issues have been resolved (as shown in the status table).
So all morning it was impossible to upload files to all Google services, such as Gmail attachments to both G Suite's personal and corporate accounts. In some cases, even a simple synthesis attempt to send a new message or reply did not work.
Google initially said it was investigating issues with Gmail and later officially confirmed a number of issues. Slowly the company began to restore its services and now everything works as before.
The problems appear to have been worldwide, according to the Downdetector.