diff --git a/src/aeros_project/service.py b/src/aeros_project/service.py
index 48d2ccf..d347931 100644
--- a/src/aeros_project/service.py
+++ b/src/aeros_project/service.py
@@ -119,7 +119,8 @@ async def import_aro_project(*, db_session: DbSession, aeros_project_in: AerosPr
             "/upload",
             content,
             "file",
-            clean_filename
+            clean_filename,
+            base_url=WINDOWS_AEROS_BASE_URL,
         )
 
         response.raise_for_status()
diff --git a/src/aeros_utils.py b/src/aeros_utils.py
index b94979a..0815c59 100644
--- a/src/aeros_utils.py
+++ b/src/aeros_utils.py
@@ -31,7 +31,7 @@ def get_aeros_session(base_url):
     global _aeros_session
     
     if not USE_LICENSE_APP or not HAS_LICAEROS:
-        if _aeros_session is None or not isinstance(_aeros_session, httpx.Client):
+        if _aeros_session is None or not isinstance(_aeros_session, httpx.Client) or str(_aeros_session.base_url) != str(base_url):
             log.info(f"Using direct httpx.Client for base URL: {base_url}")
             _aeros_session = httpx.Client(base_url=base_url, timeout=300.0)
         return _aeros_session
@@ -103,8 +103,8 @@ async def aeros_post(path: str, json=None, data=None, **kwargs):
     return response
 
 
-async def aeros_file_upload(path, file, field_name, filename):
-    target_base_url = WINDOWS_AEROS_BASE_URL if USE_LICENSE_APP and HAS_LICAEROS else AEROS_BASE_URL
+async def aeros_file_upload(path, file, field_name, filename, base_url=None):
+    target_base_url = WINDOWS_AEROS_BASE_URL if USE_LICENSE_APP and HAS_LICAEROS else (base_url or AEROS_BASE_URL)
     session = get_aeros_session(target_base_url)
     
     if USE_LICENSE_APP and HAS_LICAEROS: