Hello dear colleagues! In the last few days I've been working on a new game and I've already finished, exported, made the APK with Eclipse, tested the game, everything it's OK. After that I've made a slightly different version, with slight changes in scene design, exported it, built the APK but noticed that the mobile device doesn't "see" the APK so it can be installed. Now, going step by step, I noticed that in the exported folder from Buildbox is missing two subfolders - "bin" and "gen", and I suspect that's the cause Eclipse can't build a functional APK (during construction it doesn't give me any error, however). I tried to do other APKs from other projects and they go, so the problem is not Eclipse. I have exported, again, the original project, from which I did the version I'm talking about and it works, as well (here I can find the two subfolders mentioned, after the APK it's done), only the alternative version doesn't work. The folder has only about 38 MB and the name given to the new version is, of course, different. One more thing, if I right click on a functional APK, the file type looks like it is ".apk", but if I right click on the non-functional APK, the file type it's something like ".name-of-the-game". What could be the cause?