I upgraded a JIRA instance from 6.0.7 to 7.1.4 as described in the Upgrade and Migration Hub.
Everything works fine, but the preview of the thumbnails is no longer working. Attachments could be downloaded
fine but the preview of attached pictures is not working. Every new issue in the upgraded system comes with a correct preview, only the issues from the old instance are not shown. Is there a workaround? Logs are not showing up something special.
Thx and cheers
If you're self-hosted, try this - Thumbnail for attachment not showing after migration
Have a look at image attachments in the database and see if 'thumbnailable' is set to 0
I modified the update query as follows:
UPDATE fileattachment set thumbnailable = 1 where thumbnailable = 0 AND MIMETYPE LIKE 'image%'
Can't remember if it needs a restart afterwards.
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