Dont Worry, Google fixed the problem but to feel solved problem will take a few time to update!
What’s The Issue
Cant Send & Receive mails in inbox of gmail/gsuite
Gmail users around the world report a malfunction in the service this morning (Thursday). Users report a variety of issues, including failing to send messages, others complaining that they are unable to attach files and receive the error message: “Oops, something went wrong”.
Google has announced that they are “continuing to investigate the matter. We will release an update on 20/8/20 at 11:00 and will detail when we expect the issue to be resolved.”