Photo Uploads

Our engagement party is this weekend, and I would love a place for our guests to upload photos they take during the event for us to see. I would also ideally like to use the same link/album for any other wedding realted events i.e. my bridal shower, the wedding (1.5 years away). My fiancé's idea was to create a shareable Dropbox. Would that work? Does anyone have any experience using it for their wedding? Also open to different sites. Would love it to be as easy as possible for guests (not downloading an app) and free if possible, but I am willing to pay. Thanks!