I say DEFINITELY business like atm.
How your co-parenting (and hence communication) develops will depend on future living arrangments, custody etc.

For me it has been important to not give my W expectations that she will see everything about our children, because she wont.
TBH it hasnt been much of an issue but when she has asked I have answered business like.
Also, I never sent more than 1-3 photos no matter how long we have been away.

Me: 34
Stbxw: 30
D:5 D:3
Mini bd: May/June 2019
Married: Aug 2019
BD: 6th Dec 2019
OM Confirmed: Feb 2020
March 2020: I filed for D
Waiting for D to be finalized and W to move out end of January 2021