In Q4 of 2021, Trello made some security changes to our desktop apps for both Mac and Windows. Unfortunately, while these changes increased security for our customers, some partner products, including Power-Ups and integrations, are not compatible with Trello’s new security requirements for our desktop app. This includes the Dropbox integration, including the ability to attach Dropbox files to cards in Trello, as well as the Dropbox Power-Up on the desktop app.
This issue is still ongoing, and we are working with Dropbox to help them address the compatibility issues between Dropbox’s integration and Trello’s security requirements which has broken their integration. We are unable to roll back our security change as this would result in more bugs, and would also decrease the security of our app.
We value your feedback, and apologise for the inconvenience this causes our users wholeheartedly. Please know that we are working towards a fix here with Dropbox that’ll make sure that this integration is fixed, and decrease the chances of such an issue occurring with our integrations again.
In the interim, Dropbox is still available on Trello on the web versions of Trello as long as third-party cookies are enabled. You should be able to attach cards and enable and authenticate the Dropbox Power-Up while using a web browser to access Trello. You can see what platforms we support at https://trello.com/platforms
Our Support team are present in the Community and available to assist here as well, and our Community Leaders are also aware of this issue and can direct you to this page which shows you the web workaround while we get this fixed.
Alex WaiteAtlassian Team
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