You can transfer or save Gmail emails to flash drive using Google Takeout or by saving them as PDF files.
Google Takeout Method: Go to Google Takeout, select Mail, export your emails in MBOX format, download the file, and then copy it to your flash drive.
Save as PDF: Open an email, click Print > Save as PDF, and store the file on your flash drive.
If you need to save multiple emails at once, Advik Gmail Backup Tool can help by downloading emails in PDF, PST, or MBOX formats and directly saving them to your USB drive.
Learn More: https://www.adviksoft.com/blog/save-...a-flash-drive/