Each time I restart Photoshop, the Save for Web dialog box forgets the preset I was using. I save to JPEG 99% of the time but PS defaults back to GIF. This is a newer problem — it cropped up a couple months ago though I can't remember which version. I know Save for Web is on its way out but until Export As catches up with my needed features this regression is annoying for me (especially since I restart a lot with flaky MacOS Mojave right now.)
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