Look at hotio instead, recommended by me and popular among those that support the *arrs.

I have no guidance on your issue but just to make sure, this is two commands and not one:

docker exec -it jellyfin ldconfig

sudo systemctl restart docker

Do you get the restarting message with just the first command?

My understanding is windows does have hardlinks but has a limitation on the amount. Hardlinks link to the same data on the disk, so deleting one just deletes the link but not the data, if you delete all links then the data is deleted. You should have 2 links, one in torrents and one in media. I highly recommend trash guides for setup

The best setup uses hardlinks. Qbit downloads to your torrents directory, when it finishes downloading it tells the arrs which hardlink it during the import to your media folder and jellyfin sees it there. Hardlinks don’t take up extra space but allow you to keep seeding the original while also having a nice renamed media library. Your media folder and torrents folder should never be the same.

I also recommend unpackerr if you’re getting zip and rar files, but that wasn’t clear from your original post. Just know if you track hardlinks with something like qbit_manage, those torrents will show up as having no hardlinks.