To some extent I think you can do most of that on Lemmy.
You can upload images for your posts (not sure for short videos) and cross-post them to other communities.
Edit: I don't know kbin.social but I suspect it would be more adequate to what you want to do.
You can @ Lemmy communities and it will create posts there (not sure how well images federate)
Which instance you signed up only affects your "Local" feed (no idea if PixelFed has one, haven't checked). If you're posting primarily about your miniatures it may make sense to move to a specialized instance rather than a generic one like .social.
PixelFed and Masto federate really well so all you have to do is follow and get followed by people on the tabletop focused instances (which you already may be without realizing) for your things to end up in those communities.
There is also https://a.gup.pe though I have no clue how it intersects with Lemmy.
Thanks! I just tried testing the @-ing a Lemmy community, Pixelfed treated it as if I tried to find an user and said "no match found". I tried pasting a link to a pixelfed post in the "link" field in Lemmy post creation. It recognised the post/user but the shared media on Lemmy is ant-sized and requires more clicks (or a click on the link to get to pixelfed website).
I have chosen a mainstream instance as I believe it's less likely to be shut down due to e.g. its admin not being able or willing to pay for the server - so for stability. Do you think it's a wrong way of thinking? I'm new in Fediverse, and I'm aware that more small instances is better than a few big ones. But when I want to share something widely having an account on a big one seems reasonable?
Thanks! I just tried testing the @-ing a Lemmy community, Pixelfed treated it as if I tried to find an user and said “no match found”.
Hm, it would try to find a user, because communities are internally "users" that boost all the posts/comments they receive. ActivityPub isn't as interoperable as it ideally would be, with all the hasty extensions, quirks of particular implementations, and with Lemmy being comparatively new it may make sense for you to open up an issue on the PixelFed GitHub, maybe they'll look into it for you.
I have chosen a mainstream instance as I believe it’s less likely to be shut down due to e.g. its admin not being able or willing to pay for the server - so for stability. Do you think it’s a wrong way of thinking?
The bigger a server the costlier it is to run. That's true with every service. Most admins rely on donations on top of paying out of pocket, so as long as the small instance you're on is tight knit enough that the few people there will occasionally chip in, shutting down won't be too much of a concern.
But when I want to share something widely having an account on a big one seems reasonable?
As long as even 1 person from "a big one" follows you, your posts end up there, will be indexed by hashtags or what have you. So start following people and get followed back and eventually discoverability will sorta happen.
If there is a warhammer specific a.gup.pe group, consider @ing that as well, since the way it works (boosting all the content it receives to all it's followers) will have the same effect.
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