There are some cases when the feeds are disapproved by Google Merchant, Google Shopping Campaign, and Google Display
So, what do you do in such a case?
Actually, this issue is caused by the changed format of images after optimization. However, SEO Suite app-only compresses your images, not resize or change image format. In fact, the images are uploaded with the original format.
The error you got with Google Merchant seems to be the general issue as many other sites experienced.
Please check these links to understand more about it and see how Google advises you to fix the issue.
https://community.shopify.com/c/Technical-Q-A/Google-Shopping-Ads-Image-Processing-Fails/m-p/870384
=> Read how to resolve the problem https://support.google.com/merchants/answer/6240184
Should you have more questions, please feel free to ask for AVADA support at any time.