Hi Mickey It does not matter whether you are usk g the app or are using the website through Firefox for Android. In the top right of the screen is a sign in button for you to connect your Firefox Account to be able to send larger files. If you do not have an account you can still use Firefox Send to send files. Just add the files, select any options, tap Upload and a link will be generated that you can send to the other party securely using email or (for example) a private social media message. I hope this helps.