Discord URL sharing not working on XMPP and IRC when Media-server is off.

[poVoq]

Describe the bug
There seems to be a recent regression related to the PR that always uploads files shared from Discord to the media-server (which works fine), if the media-server is not configured.

It should then share the short lived Discord CDN link like it did before, but actually it only send the image caption text and no link at all. On Matrix however the image gets correctly shared via the Matrix native image upload service.

To Reproduce
Bridge between Discord and XMPP/IRC with no media-server.

Expected behavior
It should show the original CDN link on IRC and XMPP (or in the future use the XMPP upload service).

Environment (please complete the following information):

• Matterbridge version: output of matterbridge -version Master git from today.

[selfhoster1312]

Sorry i'm confused between different issues.

Discord sets the attachment URL, which is never removed by b.AddAttachmentFromURL (unless we merge #170 but maybe that's wrong). You're saying that when the media server is disabled, xmpp and IRC receive a message with an attachment without URL?

Only debug logs can help here.

[poVoq]

I think this might have been me falling victim again to the rate limit issue, will retest later today.

[soliton-]

Discord URL sharing on IRC still works for me. What has regressed is that attachements are downloaded unconditionally even if no mediaserver is set up. Worse is that previously meaningless options like MediaDownloadSize are now observed with no way to disable that leading to messages showing no hint that they contained an attachment or are completely skipped.

[dgrzjohn]

I am also having this issue:

[matterbridge] time="2026-04-06T01:42:37Z" level=warning msg="Failed to download attachment image.png" error="File "image.png" to large to download (4623319). MediaDownloadSize is 1000000" prefix=discord
[matterbridge] time="2026-04-06T01:42:37Z" level=warning msg="Skipping message because there is no text and file uploads all failed" prefix=discord

I have tried to set MediaDownloadSize in general and also in the discord portion of my configuration and they both seem to be ignored. I also can't tell if these files are actually being downloaded somewhere in the container?

I can confirm files under 1mb are being shared with the discord cdn link (as has always been the case with matterbridge), and anything larger does not get sent to an irc bridged network whatsoever.

I do not have any MediaDownloadPath/MediaServerDownload settings in my configuration.

EDIT:
I had tried MediaDownloadSize=0 which had no effect. Setting MediaDownloadSize=100000000 (100mb) allows larger files discord cdn links to be bridged properly. Still not sure if these are being downloaded somewhere, though.