Test query on live data
It would be faster to create new queries if you could just test queries on live data. It could be the same procedure as now, but instead of downloading and then uploading, you could just test directly. Like you click "Test", then get option for the input you want to use and the sample time, just skip the download and then upload again.
Live data testing is supported in Stream Analytics tools for Visual Studio. More information can be found in this document: https://docs.microsoft.com/en-us/azure/stream-analytics/stream-analytics-live-data-local-testing