Incomplete Upload

I have tried a couple of times now to get a map to upload properly. I am putting in all required information (map archive, screenshot, title and description) but it comes up with "Incomplete Upload" every time. I have tried both through the upload and through the edit option.
I have been able to do this before, but that was a number of months ago.

I appreciate any advice anyone may have.

have you watched the video "How to Upload your Minecraft World" in the help section?
https://web.archive.org/web/2020/http://www.minecraftworldmap.com/help

map & screenshot upload requires 2 steps: click 'choose archive' and after that click 'upload'. same with screenshot.
only choosing an archive isn't enough.

I watched the video. I am aware of the upload button. It's still not working.

I watched the video. I am aware of the upload button. It's still not working.

If you did not wait for the entire upload to be completed while on the page, the upload will be stopped. If you do not it will be marked as an Incomplete Upload.

maybe try a different browser.
enable javascript, cookies.