How can I troubleshoot and resolve a 413 error when uploading files to Google Drive?

To troubleshoot a 413 error on Google Drive, first, check the size of the file you're uploading; while Google Drive has a very high limit (5TB per file), intermediary proxies or network equipment might have lower limits. Try uploading smaller files individually. If using a web browser, clear your browser's cache and cookies, or try an incognito/private browsing window to rule out browser-specific issues. For very large files, consider using Google Drive's desktop application (Google Drive for desktop) which often handles large uploads more robustly, or use resumable uploads if interacting via the Google Drive API.