Google Web Designer help - invalid media bundle

I am trying to run dynamic display remarketing with responsive ads. I use Google Web Designer ready-made templates (Google Ads environment, Retail vertical). But even if I upload plain, ready-made templates to my google ads, I get the error message - invalid media bundle. My Google Ads and Merchant Center are well configured. As I understood this is bug of GWD, but I believe some of the people should have solved this issue. I am looking for a solution - someone to show me how to upload ready-made template from GWD (Again, Google Ads environment and Retail verticals), without compromising responsiveness and uploading each banner size one at a time.