use concurrent for the multiple file uploads instead of multiprocess.

mdrsclient/api/utils.py

@@ -1,15 +1,15 @@
 from mdrsclient.api.user import UserApi
+from mdrsclient.connection import MDRSConnection
 from mdrsclient.exceptions import UnauthorizedException
-from mdrsclient.session import MDRSSession
 
 
-def token_check(session: MDRSSession) -> None:
-    if session.token is not None:
-        if session.token.is_refresh_required:
-            user_api = UserApi(session)
+def token_check(connection: MDRSConnection) -> None:
+    if connection.token is not None:
+        if connection.token.is_refresh_required:
+            user_api = UserApi(connection)
             try:
-                session.token = user_api.refresh(session.token)
+                connection.token = user_api.refresh(connection.token)
             except UnauthorizedException:
-                session.logout()
-        elif session.token.is_expired:
-            session.logout()
+                connection.logout()
+        elif connection.token.is_expired:
+            connection.logout()