Here's a great way to add multi photos at one time. (15 photos at a time - recommended) Photos will need to put into a zip file. Not to worry if you don't have zip software, try this!

Right Click on Start menu
Choose Explore
Choose the down arrow on the end of the Address window
Browse over to your photo folder
Hold down the Ctrl key and Left click on the photo (highlights them)
With photos selected (highlighted)
Right click and choose Send To, Compressed (zipped) folder

Now...Open Grovesite and log in

On the left menu, Click on Photo
Choose [Add a New File]
In Upload window, Browse over to your zip file and select it
IMPORTANT - Check the little box that reads - For .zip file, expand and post individual files
Click Add