Download file from GCS

I have an app where I upload a file, which is then saved to the input folder in Google Cloud Storage (GCS). I also need to download the corresponding output file from the output folder in GCS. When I use the file path for the input folder, the file downloads correctly(but the downloadable file is incorrect since its a input file). However, when I use the file path for the output folder, I get an error stating that the file is not found. What formula should I use to correctly access the file in the output folder?

Please help with the expression

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