How to transfer audio files from computer to android?

Andrina writes letters that are regularly sent to hundreds of her company’s customers. because of this, she would like for the mail merge command to be in her quick access toolbar, and she wants it to be the first button on the left. what should andrina do to place the mail merge button there?

So im doing this school challenge and the teachers said whats the average text a student gets a day so i need to get about 20 in a day but dont know how can you guys 2163371293

These factors limit the ability to attach files to e-mail messages. location of sender recipient's ability to open file size of file type of operating system used