diff --git a/modules/app_upload.py b/modules/app_upload.py
index c077a15..51b1621 100644
--- a/modules/app_upload.py
+++ b/modules/app_upload.py
@@ -31,6 +31,7 @@ from threading import Thread
 
 import requests
 from dotenv import load_dotenv
+from requests_toolbelt import MultipartEncoder
 
 from modules import app_sql, app_dash, app_cellular
 
@@ -175,12 +176,26 @@ def _upload_dashcam_files():
         if app_sql.dashcam_file_marked_uploaded(rel_path, sha256):
             continue
 
+        # Stream the multipart body via MultipartEncoder instead of requests'
+        # plain files=/data= kwargs. requests builds a non-streamed files=
+        # upload by reading the *entire* file into memory up front to
+        # assemble the multipart body - fine for small files, but real
+        # dashcam clips run 300+MB each, and on a ~1GB-RAM Pi 3 that alone is
+        # enough to trigger the OOM killer (confirmed against real hardware:
+        # RSS spiked in lockstep with dashcam file size). MultipartEncoder
+        # reads the file in small chunks as the request is sent instead.
         with open(abs_path, "rb") as f:
+            encoder = MultipartEncoder(
+                fields={
+                    "relative_path": rel_path,
+                    "sha256": sha256,
+                    "file": (os.path.basename(abs_path), f, "application/octet-stream"),
+                }
+            )
             resp = requests.post(
                 f"{SERVER_URL}/api/v1/dashcam/upload",
-                data={"relative_path": rel_path, "sha256": sha256},
-                files={"file": f},
-                headers=_headers(),
+                data=encoder,
+                headers={**_headers(), "Content-Type": encoder.content_type},
                 timeout=300,
             )
         resp.raise_for_status()
diff --git a/requirements.txt b/requirements.txt
index df821e5..7c39194 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,4 +5,5 @@ pymongo
 python-dotenv
 pyserial
 obd
-requests
\ No newline at end of file
+requests
+requests-toolbelt
\ No newline at end of file