Question regarding recoverpoint image test & failover

Hello experts,

Can i ask 3 questions regarding recoverpoint.

1、During test the copy at the DR site(logged access mode with VPLEX splitter), filesystems are mounted on the DR server, if i make some change on the mounted filesystem at DR side, how can i reserve the change and replicate it back to the Prod copy ?   Normally, if when close the test, all the change on the DR server will be lost(rollback).

2、Starting RP 4.0, the failover procedure was divided into two steps(i.e. image test and actual failover), the wizard will ask you to umount the filesystems at the DR server after image test, then go to actual failover. My questions is, if i make some change during the image test, then failover the CG, will the change be reserved ? Or it will be lost just like normal image test ?

3、Prior to RP 4.0, we can do failover during image access directly, before failover it will not ask you to umount the filesystems at the DR server, will the change made during image access be reserved ? if Not, will the DR server has some filesystem problem because of the unexpected data change ? Suppose i don't umount the filesystems before actual failover.

Thank you in advance.