I’ve tried uploading my map so many times but i keep getting this error, 343 of course hasn’t been helpful AT ALL. I noticed that the 93’rd version of my map can my uploaded but the 94th and beyond cannot. They were saved one minute apart. I don’t think i did anythng to prevent it from being uploaded in that one minute but this is coded like a runescape private server so anything could be the cause
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I’ve got the same issue, can’t publish the map!
+1
I was able to publish maps just fine but I unpublished this one, worked on it a bit, and now I can’t publish it anymore.
A similar thing happened for me, but I got it working by changing the description.
I saw a reply from a dev, and he said that the description could prevent the map from being published.
He said:
- "We removed the requirement for clean data on publish but didn’t have time to change those descriptions; you should be able to publish maps with dirty data. There is an issue where sometimes map descriptions can prevent publishing; I suggest shortening or re-doing the description to see if that will unblock you."
I tried shortening it and it helped. Hope this helps! 
The issue with changing the description is that this creates a new version of the previously published map.
So I still cannot publish the latest changes.
I have even tried opening the version of the map to create a new save, hoping the description update will apply to the newest version and allow me to publish. No luck.
I was able to resolve the issue by in unpublishing the map. Ensuring my latest changes were saved as the latest version. Updating the description. Checked that the new version after the description change had the latest updates to the map. And was able to publish.