The error message of not having enough local storage to download an app appears when I attempt to download an app even though the app is 1.3 GB and there are 2.4GB free on my iphone. Why is this happeing?
Not enough space.
You need 1.3 GB for the download package.
You need an extra 1.5-2.0 GB for it to extraction.
So at this stage you need 3-3.5 GB local storage free.
After installation, the 1.3GB download package will be wiped, leaving you with the 1.5-2.0GB app.
In summary, the error message is correct because you don't have enough local storage.