What determines post thumbnails? (lemmy.world)

submitted 1 month ago by ApollosArrow@lemmy.world to c/voyagerapp@lemmy.world

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Sometimes I will post a link and no thumbnail seems to be pulled from the link. Is this a case by case basis or do I need to do something else?

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[-] ApollosArrow@lemmy.world 1 points 1 month ago* (last edited 1 month ago)

I’ve used instagram links and kickstarter like this one.

https://www.kickstarter.com/projects/soulscircuit/pilet-opensource-modular-portable-mini-computer?fbclid=PAZXh0bgNhZW0CMTEAAabHjcrS7V0rMt4arfAgb-p06cbqc4Xt2_MBsiIzrw9s0LflcpwsIcyXt0s_aem_xw_izsdlBpIrx-nhwR07sw

And someone gave this for me to use on a lemm.ee instance, but it wouldn’t load on a lemmy.world instance. https://files.catbox.moe/qtxxrk.mp4 when I tried using the same website elsewhere

I just want to get into doing more posts, but I am confused on how to get consistent visual images to load on timelines from articles, general website thumbnails, gifs and videos.