When i try to share the post via my buffer extension to social media i get a message saying "The provided image doesn't seem to be valid, yet i never changed anything before today. Any support would be appreciated.
This seems like you might be experiencing the new API guidelines regarding attachments in Trello.
EDIT - Allow me to elaborate
Attachments cannot be publicly shared directly from Trello anymore unless they are members of your board.
You'll have to download a copy and use a different sharing mechanism.
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