[Help uploading world!]

ty for the help, but another issue is i now have my server crash every time i try to import a world. this is such a headache omg

[Help uploading world!]

Ive uploaded my world, no spaces and all, but when i type UL, it isnt a command. same with /world and /worlds

i dont know what im doing wrong
ive looked at other forums, ive done everything they talk about

help!