Alert that Disk Space is almost full but there appears to be plenty of space.
I keep getting alerts that I'm almost out of storage, and sometimes iphoto makes me delete some things in order to import any new photos. But when I look at my system preferences and look at the storage it says I have 58GB available. What's going on? Both of these things cannot be true. How can I use the rest of those 58GBs? I attached a photo below of one of the alerts and how much storage I supposedly have. Thanks in advance for your help.
MacBook Pro 13″, macOS 10.14