diff --git a/api/chalicelib/blueprints/bp_core.py b/api/chalicelib/blueprints/bp_core.py
index a73a05d07..303bca306 100644
--- a/api/chalicelib/blueprints/bp_core.py
+++ b/api/chalicelib/blueprints/bp_core.py
@@ -903,7 +903,7 @@ def get_general_stats():
     return {"data": {"sessions:": sessions.count_all()}}
 
 
-@app.route('/mobile/urls', methods=['POST'])
-def mobile_signe(context):
+@app.route('/{projectId}/mobile/{sessionId}/urls', methods=['POST'])
+def mobile_signe(projectId, sessionId, context):
     data = app.current_request.json_body
-    return {"data": mobile.sign_urls(data["URL"])}
+    return {"data": mobile.sign_keys(project_id=projectId, session_id=sessionId, keys=data["keys"])}
diff --git a/api/chalicelib/core/mobile.py b/api/chalicelib/core/mobile.py
index f37e4e276..c13403584 100644
--- a/api/chalicelib/core/mobile.py
+++ b/api/chalicelib/core/mobile.py
@@ -1,11 +1,13 @@
-from chalicelib.utils import s3, s3urls
+from chalicelib.core import projects
+from chalicelib.utils import s3
+from chalicelib.utils.helper import environ
 
 
-def sign_urls(urls):
+def sign_keys(project_id, session_id, keys):
     result = []
-    for u in urls:
-        e = s3urls.parse_url(u)
-        result.append(s3.get_presigned_url_for_sharing(bucket=e["bucket"],
-                                                       key=e["key"],
+    project_key = projects.get_project_key(project_id)
+    for k in keys:
+        result.append(s3.get_presigned_url_for_sharing(bucket=environ["iosBucket"],
+                                                       key=f"{project_key}/{session_id}/{k}",
                                                        expires_in=10 * 60))
     return result