WHY DOES CONVERTING A SOLID TO SHEET METAL AND USING SKETCHED BEND LINE LEAVE THE FLAT PATTERN AFTER BENDING?
Are you adding the sketch bend to the formed model, or between a pair of Unfold & Fold features, or to the flattened configuration?
Are you in the right configuration? You might still be in "DefaultSM-FLAT-PATTERN, make sure you are in the Default config.
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