Did You Uploaded or Upload?

"Have you uploaded" and "Did you upload" are correct; it's just the 1st one is placed in the Present, the 2nd in the Past.

Which is correct upload on or upload to?

Generally you "upload to" and "download from". You might express that you "uploaded from your laptop to your server", which uses both from and to.

What is the meaning of uploaded?

transitive verb. : to transfer (something, such as data or files) from a computer or other digital device to the memory of another device (such as a larger or remote computer) especially via the Internet.