Choose a block which contain an image.
In the design area, click on the image then in the « content » tab on the right.
For example : the 600x200 image block.
You can « Show Gutter » which add space around the image. update langs set en=The image will be resized)
You can custom the image height.
For optimum display, we recommand to upload the images in the right size, as mentioned in the email builder.
Edit the height of the image before uploading it in the block. If the image is heigher than the height settings, it will be croped.
You can also add a link to your image and fill the alternative text update langs set en=alt). It is highly recommended to fill the « alt » field in case of the image doesn’t display.