Cannot edit multiple-person column value

I cannot find a way to edit multiple-person using API. I used both ways to mutate record (IDs and JSON) from documentation: People
without success.
New records work fine, people value is added.
Can someone help me?

hi @snb
As far as I know you can only set the people column. To update: you will need to read, add and write (set).

Hi @basdebruin,
So, you mean, I should delete & add whole record to update person value?

hi @snb
No need to delete the record. “Just” read it, add the person you want to add in the array returned from the read and write the modified array back.