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When I export fabric swatch images from Affinity Designer (v 1.10.5) to progressive 100 quality JPGs, the generated image file has wavy lines. What is causing this distortion and how can I fix it? EXPORT SETTINGS GENERATED JPG

Earlier today I posted two questions in the following thread, it is the first post on page 5. https://forum.affinity.serif.com/index.php?/topic/138654-artwork-for-greetings-cards/page/5/#comments I posted it there because the questions relate to something earlier n the thread on pages 3 and 4 of that thread. No replies there as yet so I am duplicating the post here. ---- Saturday 1 May 2021 Two issues that have been puzzling me. Can anyone help please? First issue. Papier (needs/prefers) CMYK at 300 dots per inch. Thinking back to when I produced the artwork for the card with the software unicorns I could not remember choosing CMYK, and checking now on a copy of the .afdesign file, I cannot find anywhere in the export facility that appears to give me a choice. Yet it is entirely possible that the original gif file was rgb colours - but I do not actually know. So is a jpg file automatically always by definition CMYK? The hardcopy print is fine. So whatever happened regarding the colours, either they were fine as sent or the Papier system did what was needed. Second issue. Also, I am wondering, if an rgb image file from outside is placed in an Affinity Designer document, and a CMYK output is requested in some format, does Affinity Designer do whatever is necessary, or is a placed image sent out as it was placed, or is the action selectable? William ---- The issue is that if one places a gif file, or a png, that is encoded using rgb and one no longer has access to the original source file, and one wishes to export a jpg from Affinity Designer, then is that possible and if so how please. The company Papier mentioned in the posts has various products, the product relevant to this question is the printing one off custom greetings card from user supplied artwork - they are high quality, I send them to myself and frame them as art. https://www.papier.com/ William