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I have a question whether anyone had a problem with previewing attachments that are put into Trello cards on a dedicated Slack channel.
It used to work like this: a person put a graphic and we see it's preview on Slack. Now we can see only a name of the file, without visuals.
I tried to reset powerup on Trello, but it didn't help.
What can I do?
The fix is actually a pretty major piece of work. Not sure you want the details but we changed the way attachments work so when you request the url for the attachment you have to be signed into Trello. It used to be that attachment urls could be seen by anyone with the url. So for example Slacks servers could read our attachment url. Although the url wasn’t public there was no authentication needed. We changed this on purpose but that changes means Slacks servers can’t see our urls because Slacks servers are not logged into Trello as you (which is basically the intended behavior). So we have to invent some new mechanism to get the attachment data to slacks servers when they request it which is not super easy.
tldr; I don’t have an estimate but I don’t think this behavior will come back soon.