As commented on the other post (Open files from a folder open by one using use application-click command - #3 by ignasi.peiris), drop a Use Application activity after the start process, with a dynamic selector to be able to attach to any open file on the list.
then do whatever actions you need to do, and end up with saving the file, either by clicking on the file, or however your file requests to be saved.
You can use the property “Close” - “Always” to close the file before the next one on the loop is opened.
BR,
Ignasi