Resize APFS (encrypted) container
Simply resizing Files (disk0s3) and then expanding the container (disk0s2) while "shifting" disk0s3 won't work.
You have to take this path:
-
Resize disk0s3 with diskutil:
diskutil resizeVolume disk0s3 40g - Create a fourth partition Files2 (HFS+) with Disk Utility at the end of the disk
- Copy all files from Files to Files2
- Remove disk0s3 (Files) with Disk Utility
- Rename Files2 to Files
-
Expand disk0s2 (if not already done automatically in step 4):
diskutil ap resizeContainer disk0s2 0