Well this is embarrassing... I found the solution I was looking for and it couldn't be simpler. I used the following code to get the desired result.
<label for="fileSelect">Spreadsheet</label>
<input id="fileSelect" type="file" accept=".csv, application/vnd.openxmlformats-officedocument.spreadsheetml.sheet, application/vnd.ms-excel" />
Valid Accept Types:
For CSV files (.csv), use:
<input
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