diff --git a/backend/open_webui/models/files.py b/backend/open_webui/models/files.py
index 6f1511cd1..cb19d83e8 100644
--- a/backend/open_webui/models/files.py
+++ b/backend/open_webui/models/files.py
@@ -6,6 +6,8 @@ from open_webui.internal.db import Base, JSONField, get_db
 from open_webui.env import SRC_LOG_LEVELS
 from pydantic import BaseModel, ConfigDict
 from sqlalchemy import BigInteger, Column, String, Text, JSON
+from sqlalchemy.orm import relationship
+
 
 log = logging.getLogger(__name__)
 log.setLevel(SRC_LOG_LEVELS["MODELS"])
@@ -32,6 +34,8 @@ class File(Base):
     created_at = Column(BigInteger)
     updated_at = Column(BigInteger)
 
+    users = relationship("User", secondary="shared_file_owner", back_populates="files")
+
 
 class FileModel(BaseModel):
     model_config = ConfigDict(from_attributes=True)
diff --git a/backend/open_webui/models/shared_file_owner.py b/backend/open_webui/models/shared_file_owner.py
new file mode 100644
index 000000000..ef6af0be3
--- /dev/null
+++ b/backend/open_webui/models/shared_file_owner.py
@@ -0,0 +1,50 @@
+import logging
+
+from sqlalchemy import exists
+
+from open_webui.env import SRC_LOG_LEVELS
+from open_webui.internal.db import get_db
+from open_webui.models.users import shared_file_owner
+
+log = logging.getLogger(__name__)
+log.setLevel(SRC_LOG_LEVELS["MODELS"])
+
+class SharedFileOwner:
+
+    @staticmethod
+    def has_access(access_type: str, file_id: str, user_id: str) -> bool:
+        """Checks if a user-file link exists in the database."""
+        if access_type != "read":
+            return False
+
+        with get_db() as db:
+            try:
+                stmt = exists().where(
+                    shared_file_owner.c.user_id == user_id,
+                    shared_file_owner.c.file_id == file_id
+                ).select()
+
+                result = db.execute(stmt).scalar()
+                return result
+            except Exception as e:
+                log.error(f"An error occurred: {e}")
+                return False
+
+    @staticmethod
+    def add_shared_file_owner(user_id: str, chat: dict) -> None:
+        file_ids = []
+        for file in chat.get("files", []):
+            file_id = file.get("id")
+            if not file_id:
+                continue
+            file_ids.append(file_id)
+        with get_db() as db:
+            from sqlalchemy import text
+            files_to_add = db.execute(text("SELECT id FROM file WHERE id IN :file_ids"), {"file_ids": tuple(file_ids)}).fetchall()
+            existing_file_ids = db.execute(text("SELECT file_id FROM shared_file_owner WHERE user_id = :user_id"), {"user_id": user_id}).fetchall()
+            existing_file_ids = {f[0] for f in existing_file_ids}
+            for file_id in files_to_add:
+                file_id = file_id[0]
+                if file_id not in existing_file_ids:
+                    db.execute(shared_file_owner.insert().values(user_id=user_id, file_id=file_id))
+            db.commit()
\ No newline at end of file
diff --git a/backend/open_webui/models/users.py b/backend/open_webui/models/users.py
index 00d504088..0052696b5 100644
--- a/backend/open_webui/models/users.py
+++ b/backend/open_webui/models/users.py
@@ -9,7 +9,8 @@ from open_webui.models.groups import Groups
 
 
 from pydantic import BaseModel, ConfigDict
-from sqlalchemy import BigInteger, Column, String, Text
+from sqlalchemy import BigInteger, Column, String, Text, Table, ForeignKey, Index
+from sqlalchemy.orm import relationship
 from sqlalchemy import or_
 
 
@@ -17,6 +18,14 @@ from sqlalchemy import or_
 # User DB Schema
 ####################
 
+shared_file_owner = Table(
+    "shared_file_owner",
+    Base.metadata,
+    Column("user_id", ForeignKey("user.id"), primary_key=True),
+    Column("file_id", ForeignKey("file.id"), primary_key=True),
+    Index("idx_shared_file_owner_user_id", "user_id"),
+    Index("idx_shared_file_owner_file_id", "file_id"),
+)
 
 class User(Base):
     __tablename__ = "user"
@@ -37,6 +46,8 @@ class User(Base):
 
     oauth_sub = Column(Text, unique=True)
 
+    files = relationship("File", secondary=shared_file_owner, back_populates="users")
+
 
 class UserSettings(BaseModel):
     ui: Optional[dict] = {}
diff --git a/backend/open_webui/routers/chats.py b/backend/open_webui/routers/chats.py
index 29b12ed67..0a4e8f17f 100644
--- a/backend/open_webui/routers/chats.py
+++ b/backend/open_webui/routers/chats.py
@@ -11,6 +11,8 @@ from open_webui.models.chats import (
     Chats,
     ChatTitleIdResponse,
 )
+from open_webui.models.shared_file_owner import SharedFileOwner
+
 from open_webui.models.tags import TagModel, Tags
 from open_webui.models.folders import Folders
 
@@ -21,6 +23,7 @@ from fastapi import APIRouter, Depends, HTTPException, Request, status
 from pydantic import BaseModel
 
 
+
 from open_webui.utils.auth import get_admin_user, get_verified_user
 from open_webui.utils.access_control import has_permission
 
@@ -610,6 +613,8 @@ async def clone_chat_by_id(
         }
 
         chat = Chats.insert_new_chat(user.id, ChatForm(**{"chat": updated_chat}))
+        SharedFileOwner.add_shared_file_owner(user.id, chat.chat)
+
         return ChatResponse(**chat.model_dump())
     else:
         raise HTTPException(
diff --git a/backend/open_webui/routers/files.py b/backend/open_webui/routers/files.py
index bdf5780fc..001921340 100644
--- a/backend/open_webui/routers/files.py
+++ b/backend/open_webui/routers/files.py
@@ -21,6 +21,7 @@ from fastapi import (
 from fastapi.responses import FileResponse, StreamingResponse
 from open_webui.constants import ERROR_MESSAGES
 from open_webui.env import SRC_LOG_LEVELS
+from open_webui.models.shared_file_owner import SharedFileOwner
 
 from open_webui.models.users import Users
 from open_webui.models.files import (
@@ -63,6 +64,10 @@ def has_access_to_file(
         )
 
     has_access = False
+
+    if SharedFileOwner.has_access(access_type, file_id, user.id):
+        return True
+
     knowledge_base_id = file.meta.get("collection_name") if file.meta else None
 
     if knowledge_base_id: