Hi, I imported Nexo file and then I had to delete to add some new transactions and now my Nexo CSV file not importing? Can someone help please? 
This is already asked. It seems Nexo changed their CSV format.
Yes, Nexo changed their CSV format yesterday, March 31, 2022.
This is a good thing because their CSV exports were broken in a major way. Among other things, exchanges from one coin to another were not recorded properly - now they are.
Now we have to wait for KOINLY to support their new CSV format.
Any news on koinly fixing this yet?
It’s fixed. There was still a problem with the new NEXO format on the NEXO side. It was not a Koinly issue.
They recommended deleting the old NEXO wallet in Koinly and creating a new one with the new format and complete transaction history from the beginning.
I did that and everything lined up perfectly with all my other wallets. It sounds scary, but it was actually super simply and the best thing to do.
Doesn’t seem like anybody from Koinly ever say anything on their message boards.
I am in the same boat!
To be honest, considering Koinly is making you pay through the nose for tax reporting, I am shocked by how bad they are in reacting to this kind of things.
Even before the change, I was using an external piece of code, created and shared by a kind user on Reddit, to preprocess the Nexo ectract, because the Koinly import was already broken.