ZIP archive of about 4.4 MB for what the name identifies as the Galaxy A10s, with no model code or contents given. Packs like this generally include schematics or board layouts used for phone repair. With them a technician can trace charging and power circuits, locate test points and components, and narrow down shorts on the mainboard. Unpack with any archiver, and compare the model number on the device label with the documents inside, since different regional A10s versions may not share identical boards.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @esquemaseletricos. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.