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Two bugs when combining files in dataflows (Folder connector):
1. If there are multiple sheets in Excel, the function and the sample transform query aren't synced. The function selects a specific sheet (you're forced to select a sheet -- see next point), while the sample function shows all sheets
2. Unlike Power BI Desktop, dataflows don't allow you to right-click Parameter in the Combine files dialog box and select Transform data. This is what I'm referring to:
The implication is that it's not possible to combine data from all sheets -- you're forced to select a sheet. Again, that's not an issue in Power BI Desktop, hence it's a bug.
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