To add files to a spec or selection item, first select "Edit" at the top right of the item.
Scroll to the bottom of the page to where you see "Files" and click the "+ Add files" button to search for and attach photos from your computer.
Once you've selected a file, you can also add an optional description, file labels and decide who the file should be shared with (partners and clients).
You can quickly add multiple files to your item by simply highlighting the ones you want when searching your computer. You can do this by clicking your "Ctrl" key and clicking on the individual files. You can also drag and drop your files from a folder directly to the "+ Add files" button without having to click it.
To delete an existing file, simply click the "X Delete" link to the right of the file you wish to remove. Then, update the item.