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Update:
My excel sheet
If i follow this pattern-1,
I will get result in my app as bellow
If i follow this pattern-2,
I will get result inmy app as bellow…
Note: If you use range you will get particular rabge of cell value only. If you do not use any range then whole shet value will appear…
But you need to give minimum permission for your gsheet to viewer to all as below.
.