No translatable rows appear in editor window w/bilingual Excel file

I'm attempting to load a bilingual Excel file into Trados (Studio 2021 SR2 - 16.2.12.9338) with the parameters in screenshot #1 below. The preview looks fine (screenshot #2), but in the editor window, there are no translatable rows (screenshot #3). Any advice on what I should be doing differently?

1. Parameters

2. Preview

3. Editor window

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