Hi, Adobe Express does support image replacement, though the placement may have changed. A user would need to select the asset they want to replace, and then in the Property Inspector, there is a button one would select that would trigger that action. In the top left, there is a feature called Replace, shown via an icon. Once you click that icon, your media categories will appear. Once you select another image from the media file, that image will be replaced vs. added. Let me know if this does not answer your question.