I accidentally deleted an important anki deck on my mac and synchronized it with every device. I do have the deck in my files so I just tried to export it to anki again. But when transported to anki, I get the notification that I already have the deck in my Collection… But when I go back to the Decks it just shows the right title but there are 0 cards in the deck… I have tried to delete it again and do it all again but it simple does not work and I don’t know how to get my deck back…
You should restore an automatic backup made just before you deleted the deck. Restoring an Automatic Backup (Recovering from Data Loss) - Anki FAQs