Never figured it out

 

I will describe what I do.

I press the bulk upload button and a certificate window pops up and you accept it. Then you will see a small window with an album icon. Personally I go to the photos that I want to upload to the S2KI server, ie 5 photos, and I copy them, then paste them in the album icon. Then a progress bar pops up.

I hope my description helps. Give it a try.

 

same way i do t.

 

You can also highlight multiple photos and drag/drop.