And I have seen in other servers that the end/nether folder using Mohist is totally visible and changeable.
Pleassssseee fix this problem 
Posts by MrWolfery
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But I would like to modify these folders like add a custom world but your server doesn't let that
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Hello,
I have done many test and I have concluded that with Mohist 1.16.5 (769) you cannot see or modify multiverse core created worlds or the end/nether worlds on the server. What I mean by modify is the ability to upload your own maps generate new worlds etc. I have seen that with spigot and bukkit there are no problems for that. I have also reinstalled the server every time I tested it (so no mods). I would love if it is possible for you to fix this problem, because I love mods and plugins and use them all the time.
Thank you
PS: I have tried both the spigot version of multiverse core and the bukkit.