I also think having this feature would be extremely useful.
Is it possible to add some magic sub-button to “Add to Paperpile” enabling me to choose the preferred folder? In this way, it’s much more fun and time-efficient to use Paperpile. Or we can choose a sort of “current folder” in the Chrome extension, which can be changed easily.
I hope adding such a feature does not create extra load on loading web pages.
I think there is an identical request on a related thread.