Hello, I would like to know if it is possible to share files that I already have and that I could add directly to the server via a share. For the moment I believe that the only way would be to upload the files via the web interface or via the client. I would like to know if I can add them via a simple command without copying them once more. Thank you!
So the only way to integrate other app with this is to use the drive / client.
There is a WebDAV interface. Please have a look at it. Maybe this is what you need: https://download.seafile.com/published/seafile-manual/extension/webdav.md
Last but not least, you can also use the API. You find the complete documentation in https://manual.seafile.com