When uploading pdf's you are able to choose "Organize papers into new folder." It would be nice to be able to choose from existing folders as well. It would also be nice to choose a default folder for new uploads.
The reason I would like this is because it doesn't seem possible to view only papers that are not sorted into a folder (at least I haven't figured that out). You can only view all papers or those inside a folder. So I would like to import into an "Unsorted" folder so I can view only its contents and move them to the appropriate folder.