If your photos are located on your computer, you can log into your account on the app's website using your browser from your computer (or non app-supporting device) by visiting: https://cluster.co/login and uploading your photos through the app's website. After logging into your account find the space you’d like to add photos to, then click the “Add photos” button in the top-right corner to bring up the photo uploader.
We support recent versions of Chrome, Safari (6.0+), Firefox (4.0+) and Internet Explorer (10+). (To find out what browser you’re using, click here.)
We only support newer browsers for uploading because these browsers make it much easier for developers to build things that upload large files. (They also make a lot of other things easier for us, too.) If you’re in the market for a better browser, try Google Chrome.