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Everything was working well in the past, but now when I try to lift a world, I stop running the server and all the other worlds disappear, It only remains visible (world).
When the server is running, all the worlds appear normally.
For information all server files disappear when it is stopped
How can I replace a specific world
This is a temporary problem, we're already working on fixing that.
In the meantime you can try to start and stop your server and see if the files are there.
Not working yet
since yesterday
did you can upload the world for me 
did you can upload the world for me
This is not possible
Not working yet, how me i can upload my worlds ??????????????
The problem of server files has been solved, now appears without problem when the server is shutdown.
But the worlds disappear, please solve the problem quickly!
Can you rephrase this in a more understandable English?
I barely understand what you are saying.
Try Making a Backup It Should Work 
NOT working !
Try Making a Backup It Should Work
Can you rephrase this in a more understandable English?
I barely understand what you are saying.
These photos will help you understand what I mean
I'm not good at English - use google translate sometimes
Sometimes all worlds do not show when the server is offline. This is a bug with Aternos.
So When I See My Aternos Files Missing And I Open My Server I See Them Come Back So...
If You Open Your Server Maybe Your Worlds Come Back I Get It!! 
These photos will help you understand what I mean
I'm not good at English - use google translate sometimes
I Think Because Your Arabic Like Me xDDDDDD
Like I said,
Sometimes all worlds do not show when the server is offline. This is a bug with Aternos.
Sometimes all worlds do not show when the server is offline. This is a bug with Aternos.
not Sometimes ! but always
And I have the same problem!
So When I See My Aternos Files Missing And I Open My Server I See Them Come Back So...
If You Open Your Server Maybe Your Worlds Come Back I Get It!!
Maybe This Will Work!
