Depends on your torrent client. Be careful that the client does not accidentally overwrite your files, replacing the completed content.

In qBittorrent you add the torrent without starting the download, and then let it or make it re-check [existing] files. it should then progress the check to completion with the correct files and file names in place.

If you have the torrent added and then put/move the files correctly, you can use the context menu “force re-check”.

When you then start that complete torrent, you’re seeding.

Here on Lemmy you can add an image and weblink to a post instead of having to add the weblink into the description.

What do you mean by safe? The linked readme has no mention of safety.

Stumbling over SimpleX again I found now that they do provide a desktop client. It’s just not very obvious on their website/room join with QR code page.

simplex chat only works with/on a mobile phone?