A Missing Function Call Caused Recolouring Failure in a T-Shirt Design Lab

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A developer running a small t-shirt design lab found two of their own artworks could not be recoloured and initially blamed the drawings themselves. One file had no fill colours at all, which displays differently across editors and browsers, and the other used two near-identical cream shades that caused the system to treat it as multicoloured. After fixing the duplicate colour, the problem persisted. Investigation revealed that the two upload routes handled colour normalisation differently. The admin library route skipped a necessary step, so some drawings were stored without the marker the editor needs to allow recolouring.

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