Sending files in threads (non-images) now work. resolves #2926

Author: fourjr

CHANGELOG.md

@@ -32,6 +32,7 @@ however, insignificant breaking changes do not guarantee a major version bump, s
 - Blocked roles will no longer trigger an error during unblock.
 - Custom emojis are now supported in `confirm_thread_creation_deny`. ([GH #2916](https://github.com/kyb3r/modmail/issues/2916))
 - Finding linked messages in replies work now. ([GH #2920](https://github.com/kyb3r/modmail/issues/2920), [Jerrie-Aries](https://github.com/kyb3r/modmail/issues/2920#issuecomment-751530495))
+- Sending files in threads (non-images) now work. ([GH #2926](https://github.com/kyb3r/modmail/issues/2926))
 
 ### Internal
 

core/thread.py

@@ -756,7 +756,8 @@ async def reply(
                                "blocked by the recipient.")
             else:
                 description = ("Your message could not be delivered due "
-                               "to an unknown error. ")
+                               "to an unknown error. Check `?debug` for "
+                               "more information")
             tasks.append(
                 message.channel.send(
                     embed=discord.Embed(
@@ -933,7 +934,7 @@ async def send(
 
         file_upload_count = 1
 
-        for url, filename in attachments:
+        for url, filename, _ in attachments:
             embed.add_field(
                 name=f"File upload ({file_upload_count})", value=f"[{filename}]({url})"
             )