Using a browser access to the URL http://localhost:9877 . From page that appears select the “tab” named “+New”, in the form write the name of your new dataset (the dataset can have the same name of another dataset) and press the “Submit” button.
Returning to the main page press the button named “Files” related to the dataset in which you want add new pcap files.
There are two methods to upload the files:
Select the Tab named “PCAP-over-IP” (red indication in the figure) and use the command suggested (blue indication) for each of your files (one by one).