

You can view Lemmy content from other fediverse platforms like Mastodon. Either directly, via a user page, a community, a hashtag, following one of those things and seeing it in your feed, or just having it surfaced in one of the other feeds when the server knows it exists (probably from someone on the server following one of those things).
You can probably do the same thing from Lemmy. I see Mastodon posts pretty often when someone tags a Lemmy community.



This seem to stem from a misunderstanding. Lemmy and Mastodon have different goals. Users of each generally don’t want the other’s content generally showing up en masse.
If you want to see something from Mastodon, you can usually get it on Lemmy, and vice versa. I don’t often see Mastodon posts either, but that’s because I only follow Lemmy communities, so I only see them when someone on Mastodon tags a Lemmy community in their post. If you want to see more Mastodon content, see if you can follow some users or hashtags from Lemmy.
But that might not be supported; I haven’t tried. If you prefer Mastodon, I’m pretty sure that you can follow Lemmy communities from there.