I have a feeling I'm overthinking this and the answer is simple.
I am trying to manufacturer a dual-gallery setup in which the gallery on the left will display the Excel files in a Sharepoint library and when a file is selected, the rows of that Excel spreadsheet will display in the gallery on the right. I'm struggling to find an example of this done already.
I imagine a collection containing the file rows could be generated On-Select of the left gallery file, then populate the collection in the right-side gallery? Or is there a simpler method?

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