Hi! This is my first try at doing this, so bluntly put I have no idea what I'm doing. I've made a civ v map in the worldbuilder which works perfectly in singleplayer, but it's been a struggle to then add it to the steam workshop. As far as I can tell, I'm following all the steps; I open modbuddy, I begin a new project, I fill out the details and select the map file, but as soon as I click 'finish' it gives me an error message about the file and sends me back to square one.

I've been unable to solve this on my own and I've not had much luck finding a solution in the online guides out there, so I'd really appreciate some help or advice from anyone here!