If any user-facing Is Gmail down issue then this can be done due to some technical issues or slow Wi-Fi or internet connection or if your Gmail application is not up to date. Please check your device or mobile internet connection or check that you are using the updated version of the application or not.
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Clear your Gmail app data. Open your device's Settings app -> Apps & Notifications -> App Info -> Gmail -> Storage -> Clear Data -> Ok. Once you're done with that, restart your device and see if that did the trick. Most of the time that will work.
Regards, Bruce