I downloaded a Coins App from the App Store a month ago for my parent’s coin collection, and that night spent less than an hour exploring it’s capabilites. I added ONE coin to my list of coins, with a picture. Today, I checked out App Cleaner, which I had forgotten I had also downloaded recently. I ran App Cleaner, and it found that the Coin App had created a 31 GB folder in my User/Library/Containers folder. Most of that space was from two .photoslibrary files it created for some reason. Kodos to App Cleaner!. I was down to 15 GB on my SSD until the I discovered that file through App Cleaner.
amiller1 about Cleaner-App