diff --git a/api/controllers/console/app/workflow_draft_variable.py b/api/controllers/console/app/workflow_draft_variable.py
index fbaa2f8f0b..5c3211ff41 100644
--- a/api/controllers/console/app/workflow_draft_variable.py
+++ b/api/controllers/console/app/workflow_draft_variable.py
@@ -252,7 +252,7 @@ class WorkflowVariableCollectionApi(Resource):
     def delete(self, app_model: App):
         # FIXME(Mairuis): move to SandboxArtifactService
         current_user, _ = current_account_with_tenant()
-        SandboxManager.delete_storage(app_model.tenant_id, current_user.id)
+        SandboxManager.delete_draft_storage(app_model.tenant_id, current_user.id)
         draft_var_srv = WorkflowDraftVariableService(
             session=db.session(),
         )
diff --git a/api/core/sandbox/manager.py b/api/core/sandbox/manager.py
index 5a0881e46f..6716c9bdcb 100644
--- a/api/core/sandbox/manager.py
+++ b/api/core/sandbox/manager.py
@@ -136,8 +136,7 @@ class SandboxManager:
         return sandbox
 
     @classmethod
-    def delete_storage(cls, tenant_id: str, user_id: str) -> None:
-        # FIXME(Mairuis): move to SandboxArtifactService
+    def delete_draft_storage(cls, tenant_id: str, user_id: str) -> None:
         storage = ArchiveSandboxStorage(tenant_id, SandboxBuilder.draft_id(user_id))
         storage.delete()
 
diff --git a/api/core/sandbox/services/asset_download_service.py b/api/core/sandbox/services/asset_download_service.py
index 56fbd580b9..138c5e551f 100644
--- a/api/core/sandbox/services/asset_download_service.py
+++ b/api/core/sandbox/services/asset_download_service.py
@@ -38,7 +38,7 @@ def _render_download_script(root_path: str, download_commands: str) -> str:
     download_one() {{
       file_path="$1"
       url="$2"
-      dest="${{download_root}}${{file_path}}"
+      dest="${{download_root}}/${{file_path}}"
       mkdir -p "$(dirname "${{dest}}")"
       eval "${{download_cmd}}" || echo "${{file_path}}" >> "${{fail_log}}"
     }}
diff --git a/api/core/sandbox/storage/archive_storage.py b/api/core/sandbox/storage/archive_storage.py
index b0c124a2dd..f7a74f515f 100644
--- a/api/core/sandbox/storage/archive_storage.py
+++ b/api/core/sandbox/storage/archive_storage.py
@@ -87,6 +87,8 @@ class ArchiveSandboxStorage(SandboxStorage):
         return storage.exists(self._storage_key)
 
     def delete(self) -> None:
-        if self.exists():
+        try:
             storage.delete(self._storage_key)
             logger.info("Deleted archive for sandbox %s", self._sandbox_id)
+        except Exception:
+            logger.exception("Failed to delete archive for sandbox %s", self._sandbox_id)