Many people use the same ad on different platforms because it saves time and keeps the message steady. This is fine, but each platform has its own style. For example, one platform might focus on pictures while another focuses more on text. If an ad looks like it belongs only to one platform, it may feel out of place on another. You can adjust simple parts like the caption or the picture shape so the ad fits the style of each platform. When an ad feels natural in its space, people pay more attention to it.