The run estimate followed each sampler's size but not what a SaveImage finally gets: a 5120x3328 sample upscaled 4x saved 20480x13312 (324 MB) without a word. A save past 64 megapixels now warns on the timeline and in the AI's run answer, with the PNG size it will take. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>