I was trying to upload my first build.
I compressed the Blueprint and tried to upload it but the forum then says "security error" and tells me to refresh site and true again... I'm on Android 9.
Normally there's no reason for a zip file to be denied on the forum (unless it's too heavy, but if it's a blueprint it should be very light).
The forum is laggy sometimes, and attaching files can be difficult then. Maybe just try later...
If you have the latest version then you don't need to post the version TXT because it is just for file support.
And we can copy it from other blueprint.