Paste the URL in the search bar, it'll fetch it locally on your instance and get you there. No need for link guesswork to find it on a particular instance.
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This is neat, but for some reason it doesn't keep me signed in if I try to access a link from my home instance.
There is no way to do this. It's a requested feature. I'm assuming you mean how if I type something like !linux@programming.dev it will make a link that when you click it, it takes you to your instance's view of it so you can comment and stuff. There's no way to do that for posts and/or comments, sadly.
Make sure you use the original link of the post and not your local version.
Use this icon on a post to copy the original link of it:
The original url will be the same domain name as the poster's instance. For example your post is: https://lemmy.ca/post/38173834
And my comment is: https://programming.dev/comment/14642812
To view such a link on your own instance, paste it into your instance's search, like this.
This feature request would make it easier: https://github.com/LemmyNet/lemmy-ui/issues/1048
Also: https://github.com/LemmyNet/lemmy-ui/issues/2318
Give those Github feature requests thumbs up reactions so the devs know to prioritize them.
Seems like this also improves the situation and might be launching with v0.20 https://github.com/LemmyNet/lemmy/pull/5057