To upload multiple images, login into your profile at Spaceio.com. Go to "My Spaces" ->"View Spaces" -> click "+" button, which will allow you to add your post, under "Projects" or "Ideas" or "Catalogue".
Select Catalogue, then click on the "Square Box" -> "Choose file", it will show a green bar, which means the image has been uploading to the system. Click on "Return Post"to check the image. Repeat the process to add more images.