in iOS (you don't need jailbreak) you had to download the files app
then copy the files to "on my iPad (iPhone if u had it)/Spaceflight Simulator/Saving/Blueprints/" and put the subfolder here (if you don't have it, use an existing folder)
in Android: (you don't need root) install ZAchiver then put the file in "Android/data/com.StefMonyona.SpaceflightSimulator/Saving/Blueprints/" then put a subfolder here (if you don't have it, use an existing folder)
that's how you do it