Xiaomi Redmi Note 8 archive, packed as a 1.81 MB ZIP, with no description of the contents in its name. Packages like this commonly carry the main board schematic or a component placement diagram. These are used to trace charging, display and power supply circuits and to locate test points on the smartphone board. Open it to see what the files are, and make sure the board version inside matches your handset, because Note 8 variants can differ.
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 @Schematics_Mobile. Enginerys does not host this file.
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The same file was posted more than once. If one link is dead, try the next.
How to open a .zip file
Compressed archive that every operating system opens without extra software.