If you upload a file that has the same name as a file that already exists in that specific directory, a number will be appended to the end of the file name. This will only occur when files are uploaded and the names are an exact match.
Renaming Files uploaded with Same Names
Let's say that a file name called "LifeInsurance" already exists (Figure 1) under Health folder, and new file with the same name is uploaded (Figure 2) to the same location. Then the new file will be renamed to LifeInsurance(1).
Figure 1: "LifeInsurance" file exist under Health subfolder
Figure 2: New file uploaded with the same name i.e. LifeInsurance is renamed to LifeInsurance(1)
To rename the file, right-click on the document and select Rename.