Strongly clogs memory. Can I safely delete these files or are they valuable? Screenshot in the cover.
Of course you can. .Apk - files, these are application installation files. If you do not know what kind of file it is, and where it got to your device from, you should definitely not launch it. And the most logical action would be to remove it.
These files do not have any meaning, delete them and then be sure to do the following:
Go to Settings, then to Security and find the Install from Unknown Sources item, REMOVE the checkbox from it !!!
Install an antivirus from Google Play, for example DR Web Light and check the whole phone with it
As the name suggests, this is the game's installation file or there is such a team of application developers. If you do not know its origin in the phone, then you should delete it. Since it may contain a virus and other malicious codes.