When uploading files to Google Drive, the filename might change only if a file with the exact same name already exists in the exact same target folder. Google Drive implements this automatic renaming to prevent overwriting existing files and preserve all your data. Essentially, Drive appends a sequence number enclosed in parentheses, like "(1)" or "(2)", to the new upload's name, differentiating it from the original while keeping the core filename recognizable.

This happens frequently in practical scenarios. For example, if you upload a draft report named "Project_Update.docx" to a shared team folder, and later upload a revised version without deleting the first, Drive will rename the second upload to "Project_Update (1).docx". Similarly, a colleague uploading another file also called "Meeting_Notes.txt" to the same folder as yours would see their file automatically become "Meeting_Notes (1).txt" to coexist with your existing one.

The primary advantage is preventing accidental data loss through overwrites, crucial for collaborative work. However, a limitation is potential confusion if numerous similarly named files accumulate. While this auto-renaming is core to Drive's conflict resolution, best practice remains using descriptive, unique filenames whenever possible to avoid relying on this feature and maintain clearer organization.