The HD of my MacBook Pro (macOS Mojave) is encrypted with FileVault.
Yesterday, I created a new partition from the Macintosh HD (APFS) using the DiskUtility and called the new partition Data (Extended Journaled).
The problem is that now I cannot copy any files to the new partition. It seems that I don't have write permissions to write anything on the new partition.
Why is that and how can I fix it?