Image Size and Resolution for Visual Editor

Question:

The image size and resolution look a bit off where it looks blurry on my iPhone 7 Plus, but fine for smaller screen sizes. Is this a Taplytics bug or did I do something wrong?

Answer:

As per Apple's Human Interface Guidelines, you should upload 1x, 2x, and 3x image assets so images display properly across screen sizes.

In Taplytics, it should look like the set up below, where you can type in the device screen size where for the 1x asset will be targeted to non-Retina iPhones, 2x assets are applied to iPhone Retina screens along with iPhones with 6 inch screens, and then anything bigger than that (iPhone Plus models) will be delivered the 3x image asset.