WavePad allows you to open files from iCloud, Dropbox and Google Drive. All of these are cloud-based storage services that let you upload, store, access and share your files from anywhere. For Dropbox the first 2 GB, for iCloud the first 5 GB and for Google Drive the first 15 GB of storage are free, but additional storage packages are available for a monthly fee.
Under the 'Open' menu of WavePad, you can choose one of the above cloud services. After authenticating with your account, you will be able to navigate through the folders to select the desired file and open it in WavePad. It should be noted that Dropbox only allows you to use the 'Apps\WavePad' folder with WavePad.
WavePad allows you to save your audio files to different cloud services including iCloud, Dropbox and Google Drive. The audio files will be uploaded under the 'Apps\WavePad' folder in your Dropbox home.
Under the 'Save' menu, you can choose any of the above cloud services. Then, you can navigate through the folders and type in a name for your file, and tap on 'upload'.
Make sure the content you are uploading is your own, otherwise it may be removed by the cloud service due to copyright infringement.