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you are in danger, if you add storage to your virtual machine (vmdk file) for the OS, if the free space on the datastore reaches Zero, you will not be able to start up your VMs, because VMs also use a swap file equal to memory, when they are started, so be warned!
In your example, the Maximum Disk Size is based on the Block Size of the Datastore.
if the Block Size is 1MB which it is, the macx size of disk is 256GB.
see here
• 1MB block size – 256GB maximum file size
• 2MB block size – 512GB maximum file size
• 4MB block size – 1024GB maximum file size
• 8MB block size – 2048GB maximum file size
You will need to MOVE the Virtual Machine to a Datastore, which has a Block Size of at least 2MB.
To create a 2MB Block Size requires the datastore to be "formated/created", e.g. needs to be set on creation.
A workaround, as it's a temp fix....
Add & Create a new virtual disk on this datastore of size 20GB to this VM.
and then update the current required OS disk to Dynamic that you need to expand, and then Expand the disk in the OS, using this new 20GB disk. (Span disks!)
this will give you a 276GB disk spanned over two virtual disks.