Extend disk space on OVA 4.0

I’m looking for a procedure to extend disk space in Graylog 4.0 OVA installation, I run my OVA on Virtualbox.
The procedure for adding additional HDDs to the appliance and extending used disk space on an old version of the graylog appliance does not work for me with the new version.
I need to extend disk space to mount a second (virtual) hard drive.
Can someone help me complete the procedure?
I would also like to copy the current data on the appliance from the primary disk to the added one.
Thanks for taking the time.
The old procedure was as follows:

Either extend disk, resize partition and extend filesystem, or if you use LVM add new disk to PV, extend VG, LV and extend filesystem.

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