At the "Recording and Delivering Capabilities" you as a Talent can offer, you will find the option "I can record and then deliver the audio files via FTP/Dropbox/Google Drive/cloud".
FTP is an acronym for File Transfer Protocol. As the name suggests, FTP is used to transfer files between computers on a network. You can use FTP to exchange/send files.
When a Buyer selects this option it means they prefer to receive the final audio file you would be delivering, and which may have a file size higher than 2mb (which is the maximum file size the Voice123 messaging system ) through a link where they can access the file and then download it.
Two very popular services you can use for sharing files are:
Dropbox: Is a file hosting service where you can store files and share them as well.
Google Drive: Is a file storage and synchronization service created by Google. It allows users to store files in the cloud, share files, and edit documents, spreadsheets, and presentations with collaborators.
When you have Gmail account, the Google Drive option is free to use, here's how to use it and share a file: https://support.google.com/drive/?hl=en#topic=14940