Ais I’ve already stated from previous links about it…
This is not an error, it is a warning that this method of creating a buffer is deprecated:
https://nodejs.org/api/buffer.html#buffer_new_buffer_string_encoding
As you state already…
I’m getting the record to add, but to note let me know what the object id is.
So the code still all works fine, you just need to look into the Mongo change with the method of creating a buffer is depreciated and see if it would affect anything in your codings and to see if you would or could change it if needed.
That is something you would have to do yourself through Mongo own support and not through Wix as Mongo is a seperate company.