diff --git a/lightrag/api/routers/document_routes.py b/lightrag/api/routers/document_routes.py
index 848d5eb8..9ea831d2 100644
--- a/lightrag/api/routers/document_routes.py
+++ b/lightrag/api/routers/document_routes.py
@@ -458,7 +458,7 @@ class DocsStatusesResponse(BaseModel):
                             "id": "doc_789",
                             "content_summary": "Document pending final indexing",
                             "content_length": 7200,
-                            "status": "multimodal_processed",
+                            "status": "preprocessed",
                             "created_at": "2025-03-31T09:30:00",
                             "updated_at": "2025-03-31T09:35:00",
                             "track_id": "upload_20250331_093000_xyz789",
diff --git a/lightrag/base.py b/lightrag/base.py
index e569de2a..3cf40136 100644
--- a/lightrag/base.py
+++ b/lightrag/base.py
@@ -720,7 +720,7 @@ class DocStatus(str, Enum):
 
     PENDING = "pending"
     PROCESSING = "processing"
-    PREPROCESSED = "multimodal_processed"
+    PREPROCESSED = "preprocessed"
     PROCESSED = "processed"
     FAILED = "failed"
 
@@ -751,6 +751,25 @@ class DocProcessingStatus:
     """Error message if failed"""
     metadata: dict[str, Any] = field(default_factory=dict)
     """Additional metadata"""
+    multimodal_processed: bool | None = field(default=None, repr=False)
+    """Internal field: indicates if multimodal processing is complete. Not shown in repr() but accessible for debugging."""
+
+    def __post_init__(self):
+        """
+        Handle status conversion based on multimodal_processed field.
+
+        Business rules:
+        - If multimodal_processed is False and status is PROCESSED,
+          then change status to PREPROCESSED
+        - The multimodal_processed field is kept (with repr=False) for internal use and debugging
+        """
+        # Apply status conversion logic
+        if self.multimodal_processed is not None:
+            if (
+                self.multimodal_processed is False
+                and self.status == DocStatus.PROCESSED
+            ):
+                self.status = DocStatus.PREPROCESSED
 
 
 @dataclass
diff --git a/lightrag_webui/src/api/lightrag.ts b/lightrag_webui/src/api/lightrag.ts
index cf9a7e7a..eac6989e 100644
--- a/lightrag_webui/src/api/lightrag.ts
+++ b/lightrag_webui/src/api/lightrag.ts
@@ -167,7 +167,7 @@ export type DeleteDocResponse = {
   doc_id: string
 }
 
-export type DocStatus = 'pending' | 'processing' | 'multimodal_processed' | 'processed' | 'failed'
+export type DocStatus = 'pending' | 'processing' | 'preprocessed' | 'processed' | 'failed'
 
 export type DocStatusResponse = {
   id: string
diff --git a/lightrag_webui/src/features/DocumentManager.tsx b/lightrag_webui/src/features/DocumentManager.tsx
index 530e98c7..204c7daf 100644
--- a/lightrag_webui/src/features/DocumentManager.tsx
+++ b/lightrag_webui/src/features/DocumentManager.tsx
@@ -52,7 +52,7 @@ const getCountValue = (counts: Record<string, number>, ...keys: string[]): numbe
 const hasActiveDocumentsStatus = (counts: Record<string, number>): boolean =>
   getCountValue(counts, 'PROCESSING', 'processing') > 0 ||
   getCountValue(counts, 'PENDING', 'pending') > 0 ||
-  getCountValue(counts, 'PREPROCESSED', 'preprocessed', 'multimodal_processed') > 0
+  getCountValue(counts, 'PREPROCESSED', 'preprocessed') > 0
 
 const getDisplayFileName = (doc: DocStatusResponse, maxLength: number = 20): string => {
   // Check if file_path exists and is a non-empty string
@@ -257,7 +257,7 @@ export default function DocumentManager() {
   const [pageByStatus, setPageByStatus] = useState<Record<StatusFilter, number>>({
     all: 1,
     processed: 1,
-    multimodal_processed: 1,
+    preprocessed: 1,
     processing: 1,
     pending: 1,
     failed: 1,
@@ -324,7 +324,7 @@ export default function DocumentManager() {
     setPageByStatus({
       all: 1,
       processed: 1,
-      'multimodal_processed': 1,
+      preprocessed: 1,
       processing: 1,
       pending: 1,
       failed: 1,
@@ -471,8 +471,8 @@ export default function DocumentManager() {
 
   const processedCount = getCountValue(statusCounts, 'PROCESSED', 'processed') || documentCounts.processed || 0;
   const preprocessedCount =
-    getCountValue(statusCounts, 'PREPROCESSED', 'preprocessed', 'multimodal_processed') ||
-    documentCounts.multimodal_processed ||
+    getCountValue(statusCounts, 'PREPROCESSED', 'preprocessed') ||
+    documentCounts.preprocessed ||
     0;
   const processingCount = getCountValue(statusCounts, 'PROCESSING', 'processing') || documentCounts.processing || 0;
   const pendingCount = getCountValue(statusCounts, 'PENDING', 'pending') || documentCounts.pending || 0;
@@ -481,7 +481,7 @@ export default function DocumentManager() {
   // Store previous status counts
   const prevStatusCounts = useRef({
     processed: 0,
-    multimodal_processed: 0,
+    preprocessed: 0,
     processing: 0,
     pending: 0,
     failed: 0
@@ -572,7 +572,7 @@ export default function DocumentManager() {
     const legacyDocs: DocsStatusesResponse = {
       statuses: {
         processed: response.documents.filter((doc: DocStatusResponse) => doc.status === 'processed'),
-        multimodal_processed: response.documents.filter((doc: DocStatusResponse) => doc.status === 'multimodal_processed'),
+        preprocessed: response.documents.filter((doc: DocStatusResponse) => doc.status === 'preprocessed'),
         processing: response.documents.filter((doc: DocStatusResponse) => doc.status === 'processing'),
         pending: response.documents.filter((doc: DocStatusResponse) => doc.status === 'pending'),
         failed: response.documents.filter((doc: DocStatusResponse) => doc.status === 'failed')
@@ -915,7 +915,7 @@ export default function DocumentManager() {
     setPageByStatus({
       all: 1,
       processed: 1,
-      multimodal_processed: 1,
+      preprocessed: 1,
       processing: 1,
       pending: 1,
       failed: 1,
@@ -956,7 +956,7 @@ export default function DocumentManager() {
         const legacyDocs: DocsStatusesResponse = {
           statuses: {
             processed: response.documents.filter(doc => doc.status === 'processed'),
-            multimodal_processed: response.documents.filter(doc => doc.status === 'multimodal_processed'),
+            preprocessed: response.documents.filter(doc => doc.status === 'preprocessed'),
             processing: response.documents.filter(doc => doc.status === 'processing'),
             pending: response.documents.filter(doc => doc.status === 'pending'),
             failed: response.documents.filter(doc => doc.status === 'failed')
@@ -1032,7 +1032,7 @@ export default function DocumentManager() {
     // Get new status counts
     const newStatusCounts = {
       processed: docs?.statuses?.processed?.length || 0,
-      multimodal_processed: docs?.statuses?.multimodal_processed?.length || 0,
+      preprocessed: docs?.statuses?.preprocessed?.length || 0,
       processing: docs?.statuses?.processing?.length || 0,
       pending: docs?.statuses?.pending?.length || 0,
       failed: docs?.statuses?.failed?.length || 0
@@ -1270,12 +1270,12 @@ export default function DocumentManager() {
                   </Button>
                   <Button
                     size="sm"
-                    variant={statusFilter === 'multimodal_processed' ? 'secondary' : 'outline'}
-                    onClick={() => handleStatusFilterChange('multimodal_processed')}
+                    variant={statusFilter === 'preprocessed' ? 'secondary' : 'outline'}
+                    onClick={() => handleStatusFilterChange('preprocessed')}
                     disabled={isRefreshing}
                     className={cn(
                       preprocessedCount > 0 ? 'text-purple-600' : 'text-gray-500',
-                      statusFilter === 'multimodal_processed' && 'bg-purple-100 dark:bg-purple-900/30 font-medium border border-purple-400 dark:border-purple-600 shadow-sm'
+                      statusFilter === 'preprocessed' && 'bg-purple-100 dark:bg-purple-900/30 font-medium border border-purple-400 dark:border-purple-600 shadow-sm'
                     )}
                   >
                     {t('documentPanel.documentManager.status.preprocessed')} ({preprocessedCount})
@@ -1460,7 +1460,7 @@ export default function DocumentManager() {
                               {doc.status === 'processed' && (
                                 <span className="text-green-600">{t('documentPanel.documentManager.status.completed')}</span>
                               )}
-                              {doc.status === 'multimodal_processed' && (
+                              {doc.status === 'preprocessed' && (
                                 <span className="text-purple-600">{t('documentPanel.documentManager.status.preprocessed')}</span>
                               )}
                               {doc.status === 'processing' && (