Symptoms
When selecting a valid network path for the SharePoint document event > upload, if the network path contains '@' character, they would not be able to proceed with the "Enter a valid directory/folder name or browse for an appropriate folder." error.
Diagnoses
Issue was due to the special character '@'
Resolution
This has been logged with K2 Support to provide ability in specifying special characters in folder name.
Workaround:-
Use a data field. If the path is fixed, before the SharePoint Documents Event, add a Data Event to update the data field. In the SharePoint Documents Event, drag and drop the data field to the Location Path.