Save path and filename not auto filling when downloading file...

through a magnet link or torrent collection on bitcomet. It used to auto fill before, but for some reason it won’t fill now.

auto-filling?

Your question isn’t very easy to understand, but it sounds like you’re trying to download a task that doesn’t have an active peers. The torrent collection and magnet links both rely on peers to get you the torrent file so your download can begin, if you cannot get the torrent file, you cannot begin download, so bitcomet will have no way of knowing what files to expect in that task. I’d recommend you try a more popular torrent and see if it works.