Trello attachments are not previewed on Slack
Asked by Anna Czapla:

Hey,

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?

Thanks!


Answers:
author: Anna Czapla
body: Seems like it's working again!

hopefully it won't disappear anytime soon ?

comments: author: Vitalii Saienko
body: Hey [@Anna Czapla](/t5/user/viewprofilepage/user-id/4342525)

Yes, we fixed it a few days ago. Glad that it works for you again ?


author: Steve Catanzaro
body: Wow, I can see the... previews! ?


author: alexandre_lebel
body: Shit, this completely broke our workflow.

comments: author: Karolis Dzevecka
body: Same here :(


author: Paulina Moscoso
body: It really does. it is frustrating.


author: Michael Pryor
body: Yes, we broke this by accident. It's on the list to fix.

comments: author: James Quinlan
body: I am also experiencing this issue. It would be great to see the image preview of a Trello attachment return


author: Paulina Moscoso
body: Is there a timeline of when we can expect this fixed? I am having the same issue.


author: Anna Czapla
body: Hey [@Michael Pryor](/t5/user/viewprofilepage/user-id/1131556) , what is the ETA of fixing this issue?


author: Kaspar H?bener
body: Lining up to hear more about a fix as well.


author: Steve Catanzaro
body: [@Michael Pryor](/t5/user/viewprofilepage/user-id/1131556) Thank you for the direct, honest response :D Looking forward to the fix.


author: Dmitry
body: Please fix this issue. Whole process, at least for me is really hard without these previews.


author: Anna Czapla
body: hey [@Michael Pryor](/t5/user/viewprofilepage/user-id/1131556) it's been almost 2 months now, do you know what is the progress of fixing this issue?


author: Michael Pryor
body: 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.


author: Nora Falcon
body: Is this true for the Cover as well or that never worked?

I'm interested in displaying the cover as an image to my Slack Rule.


author: Karolis Dzevecka
body: Hi [@Michael Pryor](/t5/user/viewprofilepage/user-id/1131556) ! It's been almost 6 months since it's broken... Can you please bring back the previous workaround until you'll invent some new system? Or give any ETA on new fix? Thank you.


author: Dastano
body: I am just curious, that issue is on all Attachments no?  

When I check our Tickets in Slack it only show a little camera Icon, same goes for Log Files, the Log Files are not shown, they just have the Filename like.  

Debug.log


Tags: slack