From 9d7c288d8699ed7a953a6a1445d9617b995c1935 Mon Sep 17 00:00:00 2001
From: pjay-io <pjay-io@users.noreply.github.com>
Date: Sun, 5 Apr 2026 10:44:13 -0700
Subject: [PATCH] fix(matrix): add filesize to nio.upload() for Synapse
 compatibility

Cherry-picked from PR #4343 by pjay-io.
Synapse rejects chunked uploads without Content-Length. Adding
filesize=len(data) ensures the upload includes proper sizing.
---
 gateway/platforms/matrix.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/gateway/platforms/matrix.py b/gateway/platforms/matrix.py
index 4f77e920a..8a3353033 100644
--- a/gateway/platforms/matrix.py
+++ b/gateway/platforms/matrix.py
@@ -604,6 +604,7 @@ class MatrixAdapter(BasePlatformAdapter):
             io.BytesIO(data),
             content_type=content_type,
             filename=filename,
+            filesize=len(data),
         )
         if not isinstance(resp, nio.UploadResponse):
             err = getattr(resp, "message", str(resp))