If you access them like regular links you wont be able to sub to them since your account is in another instance.
That's actually not true! If you format the links like this: /c/news@lemmy.pineapplemachine.com
, like I did, then anyone who clicks on them will be brought to the community on the same instance they're viewing the post from. (At least, assuming that the community has been searched for and synced on the instance already.)
Hm, that's surprising. I didn't expect mobile Chrome to work like that when copying links. Try copying and pasting the link text instead, e.g.
[!news@lemmy.pineapplemachine.com](/c/news@lemmy.pineapplemachine.com)
? But be aware that it can take a moment for the sync to happen and anything to show up, as well.