From 3aff450bae728e2aeee9f7ea027c1d688fed393b Mon Sep 17 00:00:00 2001
From: Tulir Asokan <tulir@maunium.net>
Date: Tue, 6 Mar 2018 22:43:31 +0200
Subject: [PATCH] Fix error with large thumbnails

---
 mautrix_telegram/portal.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mautrix_telegram/portal.py b/mautrix_telegram/portal.py
index 4b737f6e..1de1f907 100644
--- a/mautrix_telegram/portal.py
+++ b/mautrix_telegram/portal.py
@@ -880,7 +880,9 @@ class Portal:
                 "mimetype": thumbnail.mime_type,
                 "h": document.thumb.h,
                 "w": document.thumb.w,
-                "size": len(document.thumb.bytes)
+                "size": (len(document.thumb.bytes)
+                         if isinstance(document.thumb, PhotoCachedSize)
+                         else document.thumb.size)
             }
             info["thumbnail_url"] = thumbnail.mxc
         if height and width: