diff --git a/frontend/components/screen/RealtimePreviewDynamic.tsx b/frontend/components/screen/RealtimePreviewDynamic.tsx
index 72739e71..129d2487 100644
--- a/frontend/components/screen/RealtimePreviewDynamic.tsx
+++ b/frontend/components/screen/RealtimePreviewDynamic.tsx
@@ -222,9 +222,11 @@ export const RealtimePreviewDynamic: React.FC<RealtimePreviewProps> = ({
       return `${actualHeight}px`;
     }
 
-    // 1순위: style.height가 있으면 우선 사용
+    // 1순위: style.height가 있으면 우선 사용 (문자열 그대로 또는 숫자+px)
     if (componentStyle?.height) {
-      return componentStyle.height;
+      return typeof componentStyle.height === 'number' 
+        ? `${componentStyle.height}px` 
+        : componentStyle.height;
     }
 
     // 2순위: size.height (픽셀)
@@ -232,7 +234,14 @@ export const RealtimePreviewDynamic: React.FC<RealtimePreviewProps> = ({
       return `${Math.max(size?.height || 200, 200)}px`;
     }
 
-    return `${size?.height || 40}px`;
+    // 3순위: size.height가 있으면 사용
+    if (size?.height) {
+      return typeof size.height === 'number' 
+        ? `${size.height}px` 
+        : size.height;
+    }
+
+    return "40px";
   };
 
   const baseStyle = {
diff --git a/frontend/lib/registry/components/file-upload/FileUploadComponent.tsx b/frontend/lib/registry/components/file-upload/FileUploadComponent.tsx
index 1af4b869..5eea6d60 100644
--- a/frontend/lib/registry/components/file-upload/FileUploadComponent.tsx
+++ b/frontend/lib/registry/components/file-upload/FileUploadComponent.tsx
@@ -901,6 +901,8 @@ const FileUploadComponent: React.FC<FileUploadComponentProps> = ({
     <div
       style={{
         ...componentStyle,
+        width: "100%", // 🆕 부모 컨테이너 너비에 맞춤
+        height: "100%", // 🆕 부모 컨테이너 높이에 맞춤
         border: "none !important",
         boxShadow: "none !important",
         outline: "none !important",
@@ -938,7 +940,6 @@ const FileUploadComponent: React.FC<FileUploadComponentProps> = ({
 
       <div
         className="border-border bg-card flex h-full w-full flex-col space-y-3 rounded-lg border p-3 transition-all duration-200 hover:shadow-sm"
-        style={{ minHeight: "140px" }}
       >
         {/* 파일 업로드 영역 - 주석처리 */}
         {/* {!isDesignMode && (