Sooo unfortunately - as already found out by another Pixelfed user some weeks ago - cross posting directly from Pixelfed has big caveats: one of them is the loss of multi-picture posts where only the first is seen on Lemmy.

Here my original post, with all 4 sides: https://pixelfed.social/p/LucaPero/914475114515075522

I also tried to reply to you with my Pixelfed account (where I see your comment) but to no avail.