We are processing a high volume of Tumblr imports at the moment so thanks for bearing with us :)
I’ve double checked to confirm your import is still queued. It didn’t cancel. But please do reconnect to your Tumblr account if you’ve disconnected it, as that could be preventing it from starting.
There is a backlog of imports in our system at the moment. While it may look like your import failed, it’s just in line for processing, and luckily it’s still in the queue. At this point I’m not able to give an estimate on how long it might take to catch up with the backlog, though.