Is it possible to get IDs just of sounds (no photos)?

As @jnstuart stated, you certainly can upload them. As far as I know, the AI doesn’t deal with sound files, so any ID would have to come from other users. My suggestion would be, if you’re going to do so, put in an ID of birds (assuming that’s what you think it is) so that your observations will get looked at by people with some experience in sound ID’s.