diff --git a/app_bot/bot/core/tasks/upload.py b/app_bot/bot/core/tasks/upload.py
index e0729cd..7e165e7 100644
--- a/app_bot/bot/core/tasks/upload.py
+++ b/app_bot/bot/core/tasks/upload.py
@@ -30,7 +30,7 @@ class BaseUploadContext(RealBaseModel):
     model_config = ConfigDict(**RealBaseModel.model_config, strict=True)
     caption: str
     filename: str
-    filepath: FilePath
+    filepath: FilePath | str
     duration: float
     type: MessageMediaType
     is_cached: bool = False
@@ -39,7 +39,7 @@ class BaseUploadContext(RealBaseModel):
 class VideoUploadContext(BaseUploadContext):
     height: int | float
     width: int | float
-    thumb: FilePath | None = None
+    thumb: FilePath | str | None = None
 
 
 class AudioUploadContext(BaseUploadContext):
diff --git a/app_worker/ytdl_opts/per_host/_base.py b/app_worker/ytdl_opts/per_host/_base.py
index 1075ea1..8e0e71c 100644
--- a/app_worker/ytdl_opts/per_host/_base.py
+++ b/app_worker/ytdl_opts/per_host/_base.py
@@ -32,7 +32,9 @@ except ImportError:
 
 class BaseHostConfModel(BaseModel):
     # TODO: Add validators.
-    model_config = ConfigDict(strict=True, frozen=True, validate_assignment=True)
+    model_config = ConfigDict(
+        strict=True, frozen=True, validate_assignment=True, validate_default=True
+    )
 
     hostnames: tuple[str, ...]
 
diff --git a/yt_shared/yt_shared/schemas/base.py b/yt_shared/yt_shared/schemas/base.py
index dba945b..c637523 100644
--- a/yt_shared/yt_shared/schemas/base.py
+++ b/yt_shared/yt_shared/schemas/base.py
@@ -8,7 +8,9 @@ from yt_shared.enums import RabbitPayloadType
 class RealBaseModel(BaseModel, ABC):
     """Base Pydantic model. All non-strict models should inherit from it."""
 
-    model_config = ConfigDict(extra='forbid', validate_default=True)
+    model_config = ConfigDict(
+        extra='forbid', validate_default=True, validate_assignment=True
+    )
 
 
 class StrictRealBaseModel(RealBaseModel, ABC):