Thanks for the helpful response! And even more, thanks for hosting these files online.
Actually, I made changes to every single module in my account (KRSplat, ID 82745).
Not huge or fundamental changes though. I basically shortened the filenames, updated metadata, and changed some volume levels (possibly remastering).
It could still be time-consuming to enter a process of habitually revising and updating files, then uploading and reuploading them. So that's why I'm wondering if the website manager(s) are deterministic about it. But I'd be happy to upload updated versions of these songs (even though most aren't my original compositions; some are transcriptions, some are remixes).