Why can't I drag and drop files into my cards anymore?

[Rachel Freeth]

States "change not saved: failed to sync with the Trello Server"

[Victor N]

Hi Rachel, sorry to hear that you are getting this error and your updates aren't saved. 

It might be the internet connection firewall settings or a browser extension/plug-in blocking parts of the app.

Please can you try using a different internet connection( preferably your mobile connection using mobile hotspot - no firewall) and a different or private/incognito browser window. And let's see if the issue persists. Thanks for your time and I'll be on the lookout for your reply.