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FIX THE BLOODY THUMBNAIL ISSUE (REEEEEEEEEEEEEEEEE) M20 Puma [Light Reconnaissance Vehicle]

even if image size is the issue thats still a problem they need to fix because my bp screenshots are taken on low graphics and they still dont show for me in game but sometimes they do i dunno its really buggy and super annoying keen need to fix this it cant be that hard right its just a thumbnail

I had to reduce the thumbnail (thumb.png) to under 1MB to get it to upload. Opened and resaved it with Paint Shop at a lower quality, worked great then.
It was located in C:\Users\<yourUsername>\AppData\Roaming\SpaceEngineers\Blueprints\local\<yourBluePrintNameHere>

REEEEEEEEEEEEEEEEEEEEE I don't have this problem, but REEEEEEEEEEEEEEE

It might just be the image file size.

i posted mine last night with no problem. try reducing image to less than 300 mb

Could be if the Image is too large (above 1Mb I think?) I had issues with that before but might be different cos I just couldn't Upload them not couldn't see the thumb

mine does it too it needs to get fixed its so anoying i can never see the pics for my own blueprints

This is a steam cloud issue (if it is the same problem as mine was). It seems that this problem happens when some files in the steam cloud save for SE become corrupted.

I had this problem a month ago, and solved it by:
1. turning off steam cloud syncing
2. deleting (or just cut/pasting away) the cloud save for space engineers, found in userdata/[your steam profile number]/244850
3. restarting everything

It worked for me and for a few other people who had also tried every other trick.

If you like, here is my reddit post from when I had the same problem, with more details and all the other things I tried:
https://www.reddit.com/r/spaceengineers/comments/gx22pk/completely_unable_to_upload_blueprints_to_the/

https://forum.keenswh.com/threads/workshop-thumbnail-for-ingamescripts-broken.7402745/

https://partner.steamgames.com/doc/features/workshop/implementation?language=english#SteamCmd

You can upload a thumbnail with SteamCmd as others have mentioned - the above two links should help you figuring it out.

But yep, it's definitely broken, I get the same issue myself!

it isn't 'fixed', the issue is that when you upload a BP with a thumbnail, it fails to publish; hence the lack of a thumbnail on this build

Wait is primo's workshop issue fixed now?