@FlorahMmolao Can you be more specific as to what you mean? Canvas does not have a feature called "Presentations," and it doesn't "send" content to students.
You can post audio files on any Canvas feature that has the Rich Content Editor (RCE) - Page, Assignment, Announcement, Discussion - that the students can access and listen to. You use the Insert Media option and then upload your audio file rather than a video file. See the attached image for what an audio file looks like on a Page in one of my courses.
If you're using Modules, you can use + and then select Add File to [Module Name] to select your audio file from your Canvas files. (You would need to upload the file to Canvas first.) When students click on the item, they will be able to play the file.
If you're asking about something else, let us know and maybe someone can help with you with that.