Help - Forum Modifying uploaded levels?

Short answer: No.

Manual answer: Page 12 of Welcome to MekoramaForum guide -

Q. I’ve found that my uploaded level has some problems; is there a way to replace it?

A. Unfortunately, no. Due to the website design, any uploaded media is tied to many other fields in the database including level comments and ratings. It would be unfair to change the media (card) after this fact. You essentially have three options:

1. If there are not too many comments/ratings on the problematic level, the best option is to simply delete it and upload a new version;
2. The easiest solution, particularly if the level in question is not actually problematic - and you just want to show an alternate version - is to simply post the alternate version as an image in a comment (and consider doing so in a spoiler so that it doesn’t crowd out the other comments);
3. Lastly, if you want to preserve the feedback on the first level (and thus not want to delete it) and you have a newer version that should stand on it’s own (and receive its own ratings, etc.), then simply post a subsequent version of the card, identify it as a subsequent version in both the card title and the level page title, and make a comment either in the new level page description, in the new level comments, or in the new level caption section referencing back to the original.