You need to use your public ip and forward the port for it to work.

If you only want to resolve it internally you have to host the dns server and make every Device use your dns

You dont get the: this is a wendys joke do you?

And i dont vote for shit. Neither positive nor negative

Sir, this is a selfhosted subreddit

I wouldnt.

Nextcloud is the stable Part with functions.

Wouldnt recommend owncloud since its worse in every aspekt.

Maybe syncthing etc?