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Re:Zulip – Open-source, threading-based Slack alternative by IshKebab on Friday July 27, 2018 @03:50AM (#17624237)
Slack can do multi-line comments too.

How does Zulip handle file uploads and images?

Re:Zulip – Open-source, threading-based Slack alternative by aero31aero on Friday July 27, 2018 @04:47AM (#17624496)
Supports inline linking to images on the internet like: [caption](url-to-image) and also supports uploading files.

Do feel free to give it a test drive on https://chat.zulip.org on the stream `#test here` to get a feel for it. :D

Re:Zulip – Open-source, threading-based Slack alternative by ahel on Saturday July 28, 2018 @08:07AM (#17632803)
> file uploads

Good question. Uploading an image from slack iOS app takes forever and most of the time don't succeed.

It's not a network issue since other apps manage just fine.