With a little investigating, we found, that image attachment posts from our server do not indeed federate as well as text only status messages.

We initially suspected a bug in the queue workers or an issue on our side, but that prove to not be the case, things are being sent.

It seems, it's a matter of size that, in some Mastodon instances, leads to the destination not processing the image before saving it locally.

Why this happens from Misskey and not is a bit of a miracle right now. We'll keep looking.

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@mondstern Both are using pretty "clean" versions of ActivityPub to talk to each other. This is more like Outlook not getting eMails from Apple Mail. The code is more or less unimportant, the protocol they talk to each other with is...

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