From 00b95466f53d98dbd6a876de0cdf4d08bd81b063 Mon Sep 17 00:00:00 2001
From: Oleg A <t0rr@mail.ru>
Date: Sat, 30 Nov 2019 03:59:33 +0300
Subject: [PATCH] #227 Rewind Bytes in InputFile before send

---
 aiogram/bot/api.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/aiogram/bot/api.py b/aiogram/bot/api.py
index 675626ac..8aa26d16 100644
--- a/aiogram/bot/api.py
+++ b/aiogram/bot/api.py
@@ -138,6 +138,10 @@ def compose_data(params=None, files=None):
             else:
                 filename, fileobj = guess_filename(f) or key, f
 
+            # rewind to start of the file
+            if hasattr(fileobj, 'seekable') and fileobj.seekable():
+                fileobj.seek(0)
+
             data.add_field(key, fileobj, filename=filename)
 
     return data