When you send a large amount of money using Wise do they always ask for documentation to prove it's origin etc? I have used it many times but I need to transfer a large amount to my wife to equalise assets for a divorce. If you transfer in smaller amounts say 20K is it easier? Thanks.

I think they have limits - suggest you sign on and search with them or ask them I have always found them very quick to reply.

Wise automatically split the money I sent to the solicitor for the flat purchase in 2019
They messaged me to say it was to prevent any bounceback from the receiving bank.

Really? You think 6y old info is going to be relevant today?
Anyways, all relevant info is on wise website, if one can be bother to check.