OK, findings regarding iOS cover image. Images should be rectangular, e.g. 96x96, 128x128, etc.. iPhone has two images, one - thumbnail and one big - when you click on it for small image - 96 and 128px works. If using images bigger, e.g. 384, 512 - it will not work for big image - works any image, e.g. 96-512 Issue - you can’t use 2 images, although specification support it artwork: [ { src: "https://dummyimage.com/96x96", sizes: "96x96", type: "image/png", }, { src: "https://dummyimage.com/128x128", sizes: "128x128", type: "image/png", } it will grab ALWAYS the first image. And as result - max image to support both thumbnail and big one - it’s to use rectangular 128x128!

same. Audio just doesn't start

fixed in beta 2