VirtualBox extended dynamic disk size pit

Here's the thing , I have a virtual machine that needs to be expanded , After trying various methods on the Internet, the dynamic disk size remains unchanged after the virtual machine is turned on . All of a sudden , A flash of light , It seems that there are snapshots on the virtual machine , Delete the snapshot , After that, the dynamic disk was successfully expanded .

Ensure that there is no snapshot when expanding the virtual machine dynamic disk , If there is a snapshot, the expansion fails .

At the same time, dynamic disks only support expansion, not reduction , Pay special attention to