There is no mechanism that listens for changes to flow or global variables so how would the node know that you had changed anything?
You can of course use an environment variable set externally that is read at deploy time.
I don't need the node to dynamically update - just need to use "d:\users\siwal\downloads" in a few places in the flow so just want to be able to set it at deployment
Which I can except for this particular node
How would I get the environment variable into that node?