I created an animated gif to be inserted into Mailchimp. The gif looks fine when previewed, and also looks fine after inserting into a Mailchimp template, but when the email is sent out (I viewed on Gmail), the gif appears with weird moving lines in the background.
I saved it via Export > Save For Web (Legacy) and with the following settings. Is there something I'm doing wrong?
How did you create that background. That does not look like a fill layer. Reducing the colors to 256 color is going to show up imperfections. Try rendering a MP4 video it will have better color an animated gif and the MP4 file may be smaller than the GIF file. You posted a png file not your GIF and that PNG image has a botched background?