diff --git a/backend/open_webui/models/knowledge.py b/backend/open_webui/models/knowledge.py
index cc3ef7adee..42370c0d7e 100644
--- a/backend/open_webui/models/knowledge.py
+++ b/backend/open_webui/models/knowledge.py
@@ -232,6 +232,21 @@ class KnowledgeTable:
         except Exception:
             return None
 
+    def get_knowledge_by_id_and_user_id(
+        self, id: str, user_id: str
+    ) -> Optional[KnowledgeModel]:
+        knowledge = self.get_knowledge_by_id(id)
+        if not knowledge:
+            return None
+
+        if knowledge.user_id == user_id:
+            return knowledge
+
+        user_group_ids = {group.id for group in Groups.get_groups_by_member_id(user_id)}
+        if has_access(user_id, "write", knowledge.access_control, user_group_ids):
+            return knowledge
+        return None
+
     def get_knowledges_by_file_id(self, file_id: str) -> list[KnowledgeModel]:
         try:
             with get_db() as db:
diff --git a/backend/open_webui/routers/files.py b/backend/open_webui/routers/files.py
index e10722c0c8..39b747fed8 100644
--- a/backend/open_webui/routers/files.py
+++ b/backend/open_webui/routers/files.py
@@ -27,6 +27,7 @@ from open_webui.constants import ERROR_MESSAGES
 from open_webui.env import SRC_LOG_LEVELS
 from open_webui.retrieval.vector.factory import VECTOR_DB_CLIENT
 
+from open_webui.models.channels import Channels
 from open_webui.models.users import Users
 from open_webui.models.files import (
     FileForm,
@@ -138,6 +139,7 @@ def process_uploaded_file(request, file, file_path, file_item, file_metadata, us
                 f"File type {file.content_type} is not provided, but trying to process anyway"
             )
             process_file(request, ProcessFileForm(file_id=file_item.id), user=user)
+
     except Exception as e:
         log.error(f"Error processing file: {file_item.id}")
         Files.update_file_data_by_id(
@@ -247,6 +249,13 @@ def upload_file_handler(
             ),
         )
 
+        if "channel_id" in file_metadata:
+            channel = Channels.get_channel_by_id_and_user_id(
+                file_metadata["channel_id"], user.id
+            )
+            if channel:
+                Channels.add_file_to_channel_by_id(channel.id, file_item.id, user.id)
+
         if process:
             if background_tasks and process_in_background:
                 background_tasks.add_task(
diff --git a/backend/open_webui/routers/knowledge.py b/backend/open_webui/routers/knowledge.py
index f67390518b..1501f8effd 100644
--- a/backend/open_webui/routers/knowledge.py
+++ b/backend/open_webui/routers/knowledge.py
@@ -363,11 +363,6 @@ def add_file_to_knowledge_by_id(
             detail=ERROR_MESSAGES.FILE_NOT_PROCESSED,
         )
 
-    # Add file to knowledge base
-    Knowledges.add_file_to_knowledge_by_id(
-        knowledge_id=id, file_id=form_data.file_id, user_id=user.id
-    )
-
     # Add content to the vector database
     try:
         process_file(
@@ -375,6 +370,11 @@ def add_file_to_knowledge_by_id(
             ProcessFileForm(file_id=form_data.file_id, collection_name=id),
             user=user,
         )
+
+        # Add file to knowledge base
+        Knowledges.add_file_to_knowledge_by_id(
+            knowledge_id=id, file_id=form_data.file_id, user_id=user.id
+        )
     except Exception as e:
         log.debug(e)
         raise HTTPException(
diff --git a/src/lib/components/workspace/Knowledge/KnowledgeBase.svelte b/src/lib/components/workspace/Knowledge/KnowledgeBase.svelte
index 26690b3c33..876741eed7 100644
--- a/src/lib/components/workspace/Knowledge/KnowledgeBase.svelte
+++ b/src/lib/components/workspace/Knowledge/KnowledgeBase.svelte
@@ -206,16 +206,16 @@
 
 		fileItems = [...(fileItems ?? []), fileItem];
 		try {
-			// If the file is an audio file, provide the language for STT.
-			let metadata = null;
-			if (
-				(file.type.startsWith('audio/') || file.type.startsWith('video/')) &&
+			let metadata = {
+				knowledge_id: knowledge.id,
+				// If the file is an audio file, provide the language for STT.
+				...((file.type.startsWith('audio/') || file.type.startsWith('video/')) &&
 				$settings?.audio?.stt?.language
-			) {
-				metadata = {
-					language: $settings?.audio?.stt?.language
-				};
-			}
+					? {
+							language: $settings?.audio?.stt?.language
+						}
+					: {})
+			};
 
 			const uploadedFile = await uploadFile(localStorage.token, file, metadata).catch((e) => {
 				toast.error(`${e}`);
@@ -441,16 +441,14 @@
 	};
 
 	const addFileHandler = async (fileId) => {
-		const updatedKnowledge = await addFileToKnowledgeById(localStorage.token, id, fileId).catch(
-			(e) => {
-				toast.error(`${e}`);
-				return null;
-			}
-		);
+		const res = await addFileToKnowledgeById(localStorage.token, id, fileId).catch((e) => {
+			toast.error(`${e}`);
+			return null;
+		});
 
-		if (updatedKnowledge) {
-			knowledge = updatedKnowledge;
+		if (res) {
 			toast.success($i18n.t('File added successfully.'));
+			init();
 		} else {
 			toast.error($i18n.t('Failed to add file.'));
 			fileItems = fileItems.filter((file) => file.id !== fileId);
@@ -462,13 +460,12 @@
 			console.log('Starting file deletion process for:', fileId);
 
 			// Remove from knowledge base only
-			const updatedKnowledge = await removeFileFromKnowledgeById(localStorage.token, id, fileId);
+			const res = await removeFileFromKnowledgeById(localStorage.token, id, fileId);
+			console.log('Knowledge base updated:', res);
 
-			console.log('Knowledge base updated:', updatedKnowledge);
-
-			if (updatedKnowledge) {
-				knowledge = updatedKnowledge;
+			if (res) {
 				toast.success($i18n.t('File removed successfully.'));
+				await init();
 			}
 		} catch (e) {
 			console.error('Error in deleteFileHandler:', e);
diff --git a/src/lib/components/workspace/Knowledge/KnowledgeBase/Files.svelte b/src/lib/components/workspace/Knowledge/KnowledgeBase/Files.svelte
index 14c105f791..37a0ab454f 100644
--- a/src/lib/components/workspace/Knowledge/KnowledgeBase/Files.svelte
+++ b/src/lib/components/workspace/Knowledge/KnowledgeBase/Files.svelte
@@ -50,7 +50,9 @@
 
 						<div class="line-clamp-1">
 							{file?.name ?? file?.meta?.name}
-							<span class="text-xs text-gray-500">{formatFileSize(file?.meta?.size)}</span>
+							{#if file?.meta?.size}
+								<span class="text-xs text-gray-500">{formatFileSize(file?.meta?.size)}</span>
+							{/if}
 						</div>
 					</div>
 				</div>