itimpi

Have you tried unsettling the option in the pool settings to allow it to be used for User Shares?   Nor sure if that would work or not?

Have you rebooted since trying to install the purchased licence key?

Looking at you share settings what you are seeing is expected behaviour.
 
With you largest data drive being 10TB and using high-water allocation method then the points for switch drives occur at the 5GB, 2.5GB, 1.25GB etc points.   You are currently in the 2.5GB zone, and since disk1 is down to 1.25GB free Unraid has switched to disk2.

Each pool can be configured independently both in terms if the number of drives in it, the type of file system and any raid levels.

If you have hard links then the space will not be released until all such links are deleted so there are none remaining for any given file.

For security reasons a password is now mandatory even when logging in locally.    You could always set your browser to remember it.

Try removing the Mover Tuning plugin.    Been quite a few reports recently of it causing this sort of issue.

You could try uninstalling the Mover Tuning plugin and see if then woks as expected.

Leaving a gap is not a problem.
If you want to close the gap then it would involve rebuilding parity to match the new drive assignments which you say you do not want.
 
FYI:  If you only had parity1 then this could have been done without a parity rebuild as parity1 does not use disk number as part of its parity calculations whereas parity2 does.

Yes to Maintenance mode, but no need to use terminal as you can do it from the GUI by clicking on the drive in the GUI as described in the link and this is recommended as less error prone.

You have Export=No which means they are not available via the network.   for security reasons this is the default setting and you have to explicitly set it to one of the other options.

The ‘nobody’ user is normally the correct user.   Have you tried running Tools->New Permissions against a share which has these problems.

Your Split Level setting is too restrictive.  Split Level will over-ride the other settings in the event of contention on selecting a drive.

If you restart in normal mode then the emulated disk should now mount and you can check that it has the data you expect.   When you get around to rebuilding then the contents of the emulated disk will be rebuilt onto the physical replacement drive.

You have a limited number of automated licence transfers per year.    If you need to do more than that then you need to contact support.

Not at the moment as far as I know.   
 
Whether an official API is ever going to appear I have no idea but with the large number of internal changes likely to be needed for the 6.13 release that release is probably Limetech's priority at the moment.

That is expected behaviour.    The potential cutover points are based on the size of the largest data drive.   Since you say this is 8GB the first cutover point will occur when disk1 has 4TB left.    Since at this point no drive has more than 4TB free then disk1 will continue to be used until it has 2TB free.    It as that point you should expect disk2 to be used until it is down to 2TB free, etc
 
This is described in some detail here in the online documentation accessible via the ‘Manual’ link at the bottom of the GUI or the DOCS link at the top of each forum page.
 

Are you getting the Unraid boot menu?
 
If not then rewriting the bz* type files as described here in the online documentation accessible via the Manual link at the bottom of the Unraid GUI.  In addition every forum page has a DOCS link at the top and a Documentation link at the bottom might help.

Try using the Manual method of creating the flash drive - it tends to be more reliable.

What file system type did you use for the cache?    If it was XFS then the answer is yes.   However if it was BTRFS then you can new drives dynamically.
 
You may find this section of the online documentation to be of use.
 

You should probably run Tools->New Permissions (probably better named as Reset Permissions) on the shares to get them to the Unraid defaults so that the SMB level ones then get applied for network access.

Yes.

The easiest way is to make the pool redundant by adding another drive to it and running it in RAID1 configuration.   However that is still not foolproof as things other than drive failure can cause data loss so you should still have a backup strategy for the data such as using something like the appdata backup plugin to make regular backups to the main array.

A drive will not be included in the space for a drive until there is at least one folder/file for that share on the drive.
 
BTW:   You can leave the included disks field empty if you want all disks to be allowed.

Dynamix File Manager always uses a copy/delete strategy regardless of whether the files are located as this is safest.   Doing a move can sometimes result in unexpected results.