My point is that just because the feature tree show the part as being sheet metal doesn't mean it will have the flat pattern you need. Finally creating it as a loft generated the correct flat pattern. Most attempts ended with a flat pattern that was simply a rectangle, this was clearly not correct. Last night I wanted to create a sheet metal cone that had a 16" OD on one end, a 12" OD on the other. The program needs something fixed or it has no idea what the reference "zero" is. Solid models converted to sheet metal need a fixed edge/surface as a reference for all other features to "unbend" around, sort of like it's an axis for rotation/unbending. The sheet metal module operates a bit differently than solid modeling. Very often a part created in solid modeling may convert to sheet metal but not be able to generate a flat pattern.
Expand the feature (+) right click on the mouse on the "Flat Pattern" (try one or the other) will give you the option to un-suppress it and lay it flat.
The "Flat Pattern" is the bottom feature in the model tree and it's suppressed. With sheet metal parts there's a "Flat Pattern" feature that's created automatically but it greatly depends upon how the part was created. I think the latest version I've used is 2019.
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