When you move your torrent files (for example to place them in the Jellyfin directories), it may be necessary to perform a few operations in your torrent client, so that your files remain seeding.
On Flood, the change is very simple. You just need to right-click on the relevant torrent, and choose the "Set download location" option (or "Déplacer" if you have set the interface to French).
In the window that opens, simply choose the new path for the torrent, making sure that the "Move data" checkbox is unchecked.
All that's left is to stop, then restart the relevant torrent. It will automatically switch to "Checking" status (or "Queued", if another torrent is already checking). Note that depending on the file size, this check can take up to around ten minutes.
Once finished, your torrent will be available for seeding again.