Uploading sensitive data, Should I user memoryStorage (buffer) or save and delete file?

I need to save very sensitive data from an Excelfile that the user uploads. The data will then be saved to mySQL. All is done in Node.js.
Now I wonder what is the most secure way to upload the file.
Should I use Multer (https://expressjs.c… Continue reading Uploading sensitive data, Should I user memoryStorage (buffer) or save and delete file?