Could you please share a screenshot of the configuration of your flow?
Please check if your network status isn't normal when the flow run failed with timed out error.
Please make a test again and make sure if your network status is normal to see if the issue still exists.
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I had stumbled upon the same and I found - https://docs.microsoft.com/en-us/data-integration/gateway/service-gateway-onprem#considerations
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Hi v-yuazh-msft... My flow also fails and gateway time out is the error message. I am using On-Premise gateway to connect to shared drive.. Could you please suggest how to resolve this issue, file size is 3MB