RAR archive named simply G730, about 2.96 MB. The name does not state the brand or the files inside, so extract it with WinRAR or 7-Zip and inspect the contents. The token may refer to a phone model code, but that cannot be confirmed from the name alone. If it contains schematics or layout drawings, use them to trace power rails and locate components. Make sure the model and board marking of the device match before relying on them.
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 @schematic_mobiles. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.
7-ZipWinRARThe Unarchiver (macOS)