[Servers using previous versions?]

To keep it from corrupting*

[Servers using previous versions?]

I'm trying to import a 1.12.2 world into the dashboard and it doesn't seem to be working. The world file (ZIP) is pretty large and takes a while to gain % on the uploading, so i just leave for a while and come back to it showing: Upload World (next line) Upload a world to your server. (three lines down) No file selected. [Choose File]

I joined the server in 1.14.3 but nothing is there from the world i'm importing.

How can i convert my server to 1.12.2?