Incorrect error when updating/uploading mod

I uploaded a pair of mods back in May - a data mod and a UI mod. They worked fine.

Now, trying to update them, the system refuses to accept them, telling me that “only AOEII mod files are accepted” despite all files being accepted filetypes. No bitmap, no wav, just .wem, all files are those that work in the base game folders. The only files I have are .json, .png, .dat, .dds, .campaign, .txt, .wem, .ai, and .per.

I’ve added a campaign to the files, but that’s not a problem, as I’ve seen many other mods publish data and campaign files together.