How to give a new player worldedit but only to work on their assigned plot - not on the whole world?

1.) How do I give (as op) full access to unlimited worldedit to players but only on the specific region / plot which is assigned for them.
Our world is protected by worldguard so nobody can place nor break blocks anywhere. (only new players can build on assigned by worldguard plots created for them)
So how to give them the worldedit full access but to work only on those plots? so that they can't destroy nor touch anything other than their plot please?
When I give a new player worldedit access with PEX (permissionsex) he can use it but the problem is that he can use it not only on his plot assigned to him but he can
make any changes on the entire world! Is there anyway to change it please? any perhaps another plugin that defines or limits the area within which specific players can use worldedit?
This issue we have is really a big limitation for all as I cannot give worldedit so that they can edit everything.. so I'd greatly appreciate someone kind to help us out how to work this out.

2.) The skins of anyone never show. Everyone always have default minecraft steve's skins. On all the other servers all the skins of all of us work but on our aternos server they never worked ever since
we started.

(link to the old thread where the 1st question wasn't answered:
WORLDEDIT / WORLDGUARD - How to allow players on our aternos server to use full unlimited worldedit but ONLY in selected regions protected by worldguard?

Many thanks:
Aternos user: B4zuM
[email protected]

Thanks again Roman for your response - you're the best here on these forums for sure as I can see.

Question 2 is solved.

and question 1 also but partially: (I did try many plugins and did a loads of research)

-> plotsquared does it automatically but only on it's regular square plots

Primarly I want to have the limited worldedit on custom regions/plots that I assign to players with worldguard.

How far did I get it done:

Installed worldguard extra flags plugin and: in worldguard I set 2 flags:

- one on __global__ region (selection region on the entire world) /rg flag RGNAME worldedit deny

- and any regions I create for players I have to add the flag separately on those regions: /rg flag RGNAME worldedit allow

- (also it is a must to setup permissions e.g. in permissionsex for worldedit - otherwise w.e. works only for OPs)

The only problem remaining is: all players can build on all regions where /rg flag RGNAME worldedit allow

is on. (they only can't build the rest of the entire world as protected by __global__)

I thought that only the owners/members of the region will be able to use worldedit on that one particular plot - but they can use w.e. on all regions with worldedit allow flag^ Is there any way to narrow that pls?

The plugin: limitedworldedit does work automatically limiting w.e. to regions by worldguard but it has a limit of 100 blocks and there was no way we could change it - tried everything.

I'm sharing this and hoping it helps someone at some point.

As the issue is partially not resolved I'd like you to allow the thread to be continued. Possibly perhaps someone will be able to advice the permanent solution.

Other than that: I'd like to ask:

- what is the maximum size of world that can be held on aternos at the moment?

Our world is already 82 MB. Should I start to worry before it exceeds the limit?

If I remember correctly a year ago the limit was 100 MB but I found a thread where someone said it's 200 MB now , is it true?

How many worlds can we have at the same time (multiverse) and what is their maximum size allowed please?

Is there any way to pay for the service to allow us to have a bit larger world size?