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Attached images becoming 'Unknown Attachments'.

SB_ux233y

Hello,

When I open certain pages with attached images in 'Edit' mode, I find that the images are replaced by 'Unknown Attachment' placeholder text even though they've been physically attached to the page.

The funny thing is that if I proceed to save the page, the images are permanently replaced by the 'Unknown Attachment' placeholder text in View mode. The only way to retrieve them in this case is to revert the page to its previous version, and reattach the images before saving the page.

What could be causing this?

Thanks,

Sean.

Accepted answers

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Diego_88dj6o

Hello there! Great to have you in our community, @SB.

What I got from your description, is that page attachments in specific pages become the “Unknown Attachment”.

I have seen this issue a few times and there is a chance that you are being affected by the following bug:

[Confluence Server] Attachments become 'Unknown Attachment' in the page editor with Collaborative Editing turned on

We could try to turn collaborative editing off and on. After that, we could check if the issue is still present. Here is how to proceed.

Click the Cog icon in the top right corner

Select General Configuration

Select Collaborative editing

Click Change Mode

Select Off

Apply

Click Change Mode again

Select On

Apply

Check if the issue is still present

For further investigation, would it be possible for you to give us a little more information? Here is a concise list of questions to help us better understand this situation:

Is this affecting other types of attachments

Do the affected attachments have special characters in their names?

When did you first face this issue?

Which version of Confluence are you running?

Let us hear from you, Sean! Looking forward to your reply.

Sean Braganza

Thanks for your response, Diego.

Turning collaborative editing on and off seemed to have no effect on the issue whatsoever. Regarding your questions:

1. No, so far it only seems to be affecting images.

2. No special characters in the name. Initially we were of the impression that solely PNG images were being affected, but this doesn't seem to be the case.

3. The issue began many months ago, somewhere around April - May, after we upgraded Confluence from 5.x.x to 6.x.x. That was the time we started missing a few missing images but it wasn't very prominent.

Last week we updated Confluence to 7.0.1, following which we started facing issues with our local server. The machine's memory modules were replaced, and that's when we started noticing more and more 'unknown attachments'.

This makes me feel that the 'unknown attachments' issue is caused by a servers-de problem more than anything, but I wouldn't know how exactly.

4. As I said, version 7.0.1.

Sean.

Diego_88dj6o

Thanks for keeping the thread alive, @Sean Braganza !

I will now try to address some of the answers you brought to the table. Let us begin.

“Turning collaborative editing on and off seemed to have no effect on the issue whatsoever.”

Are you referring to already problematic images (missing images) or even newly added images (after the off-on procedure) are affected?

“3. The issue began many months ago, somewhere around April - May, after we upgraded Confluence from 5.x.x to 6.x.x. That was the time we started missing a few missing images but it wasn't very prominent.”

We could try to re-index your instance and check if the images are still missing. There are two types of re-indexing. One that does not require restarting the instance and a more “complete” one. Here is the documentation for both:

[Confluence Server] How to Rebuild the Content Indexes From Scratch on Confluence Server

[Confluence Server] Content Index Administration

One important note is that rebuilding the index from scratch requires instance downtime. Also, while the re-index via the interface (no restart needed) does not require downtime, you and your users will experience a degraded performance as a result of the process being executed. So it is highly advisable to also schedule downtime for this procedure as well.

Let us hear from you, Sean!

Dorte Jacobsen

Hi @SB - was your "unknown attachment" issue resolved by re-indexing?

We are currently facing the exact same issue (Server 7.2.0): images that were attached and displayed in pages become "unknown attachment" when opening the editor.

This seems to happen randomly: not all pages are affected and initially we wrote it off as a user error (we have just converted from another tool and thought we had overlooked a few pages in the process).

Thanks,
Dorte

Reinhard Mayr

We also encounter this problem every then and now. I found that when I switch to edit mode and then "..." button on the lower right > Revert to last published version brings the images back.

Still, reason is unknown

L2 Application Support

Hi, I´ve also tried that solution I found but it´s not working for me

Arianna Royster

Hello! We are experiencing a similar issue. I will use the editor and publish the page with the images. Now when we go back (sometimes months later) and edit the title of the page all the attachments will then says ? unknown attachment.

We use Scroll viewport on one of our sites and we don't on the other. This issue has been in the viewport instance mostly.

Dorte Jacobsen

Atlassian Support has been helpful and let me know that Atlassian development has the issue (or at least a very similar one) in their short term backlog: CONFSERVER-55928 so there's hope that the issue will be resolved.

Dorte Jacobsen

Atlassian has fixed the "unknown attachment" issue as bug, see https://jira.atlassian.com/browse/CONFSERVER-55928

In 7.7.3 and 7.8.0 the issue should not occur but existing pages with the issue will have to be fixed manually.

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