In order to add images to WSN Gallery more quickly than doing one at a time, you can collect the images into a .tar.gz file. Use a compression tool such as http://www.7-zip.org for this. First group all the images into a TAR archive, then compress the .tar file into a .tar.gz file. (A plain .tar file will work, but it's much better to compress it to save upload time.)

Be sure that you have named all your files in the way you want them to appear in the gallery. Images will be titled as the filename without the extension.

In the 'Miscellaneous' area of you admin panel, click 'Mass Upload'. Choose the category which you want the images to be added to, the image type which they should belong to, and upload your .tar.gz file there.