Windows 10 VM not recognizing resized HD

Greetings,
I am using PD15 running a Windows 10 VM.
Both are using the latest updates.
I have a variable size VM. It is not fixed in size.
I wanted to change the size of the VM hard drive from 512GB to 750GB.
This Windows 10 VM is running on a Thunderbolt external SSD drive; it is not running on the primary HDD where the Mac OS is located.
I changed the HDD capacity to 750GB but when I start the Windows 10 VM, Windows explorer still says '512' GB HDD, not 750GB or thereabouts.
Would anyone have any ideas on how to get around this?
Thanks.

 

Hi, did you try steps from this KB article?

 

Hello.
I tried the first part but it did not help. Does my VM need to be STATIC first and not variable?

 

Hello. I followed the steps and installed the trial version of the Acronis software. It will not allow me to resize the disk since it's just a trial version.

 

This VM is on an external Thunderbolt SSD because trying to shrink it while on the same SSD on the Mac will corrupt/destroy the Mac file system. Now it seems I can neither expand the variable disk successfully; the Windows VM does not recognize the new size of the disk, and changing it to static disk at the new size doesn't work either.