Drag a block onto the artboard, or click one to drop it after
whatever you have selected.
Placing
Click an image here, then the picture on the artboard it should
replace. Or skip the library: drag a file from your desktop straight onto a picture, or copy an
image and paste it with the artboard selected.
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100%
Nothing on the canvas yet
Paste in the HTML for an email and it appears here as a live preview. Add the rest of the flow and you can see them side by side.