Here was the best tutorial I could find for it.

You can create posts in Lemmy communities by tagging the community account
(It should be a public post)
If the community account is tagged with @, it will share the post and the post will also appear in the forum.
For example, this is a post I created from Mastodon in feddit’s #Tischtennis forum: metalhead.club/@caos/112749905… … and this is how it is displayed in Lemmy: feddit.org/post/556495

The only thing to note from Mastodon and Akkoma etc. is: The beginning of the post/the first paragraph becomes the title of the forum post, as Mastodon does not have a heading field. (see also: Instructions Creating a post from Mastodon)

So it is best to start the post like this (see image 1):

This is my headline (as descriptive a title as possible)
@community@lemmy-instance
This is the further text, link etc.
if necessary a picture (only in the initial post a picture is transferred from Mastodon to Lemmy, between Lemmy and Friendica all images in answers are transferred in the meantime)

Graphic ᵈᵉˢᶦᵍⁿ is my ₚₐₛₛᵢₒₙ

@QuinnyCoded hi can I get a cat pic?

@ElectroLisa yaay it works!!

hello from cyberplace

When things are syncing, they should be getting all messages and not just the @ ones. This is based on my twin finding a post I made to lemmy and commenting on it from mastodon. As long as I replied to their comment, they saw it and I never used the @.

Although this is the opposite, maybe. Someone from mastodon made the post, instead of commenting on a lemmy post from mastodon.

Also the @ was just something mastodon does and we found twin could remove it on their end and I’d still be alerted I had a reply.

Edit - they won’t be alerted of this message though, as it’s not a top level comment. They’ll get yours because yours is. But mine is a comment to you. They’d still see it if they read the thread though.

@happy_wheels hiii blahaj friend!! :3

@sunoc oh hello :3

it really didn’t take long for this account to be discovered huh