Export Snap bandmath result

I get a result from bandmath in Snap (Eg.linear to/from dB),but i can`t get the result of linear to/from dB in exported product ,how to export the result as a band as Sgma0_VV by Rster->Geometric->resampling,help

in the Band Maths, disable the “save as virtual band” option. Then save your product (File > Save Product) after computation. You can then follow these guidelines on exporting data.
Export of products from SNAP

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Thank you, your answer is very helpful to me