Each event tier comes with a fixed amount of storage. Every event tier that mentions a number of uploads it can receive from guests is an estimate based on the storage capacity of that event tier, not a hard limit. Our calculations assume an average photo size of 3mb which has served our customers well.
The unlimited tier comes with 50gb of actual storage to be used for photos and videos. This will hold around 16,000 photo uploads when the average size per photo is 3mb.