Can I use the same photos I used from my previous project?

Yes, you can. From the options in the picture panel, select ‘My Photos’ and you will see the list of projects you previously designed, and from there select images you wish to use again. This saves the time for uploading the same photos. 

Select Images from the left panel and click 'My photos' 

Choose the desired photos from the list and click Import Selected Photos. 

The selected photos will now show in your project ready to be used on your pages.