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Have you ever wondered how Lemmy and Mastodon federate?
(furries.club)
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this post was submitted on 15 May 2025
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@Skiluros Heading URL is the 1st line of your mastodon post.
You can join an image to your mastodon comment and it will show on lemmy (a new post will just show the link to the post)
For URL and thumbnail I don't think you can.
IIRC, when the URL (on the Mastodon side) is the first line, it pushes a text URL as the heading in Lemmy.
Image attachments work too, if you're only using images.
The issue is you can't have a Lemmy URL, a text heading and a custom thumbnail image in a single post.
This creates problems if you have both a Lemmy community and a Mastodon account and you want post only from the Mastodon account (with the post also going to Lemmy).
I spent a lot of time experimenting with this and I couldn't find a good solution. I stick to posting to Lemmy and Mastodon using separate accounts.