We are currently not able to access the audio from the lenses when using Camera Kit for web, this cause the problem of not being able to record the audio through a custom recording feature on the web app.
Recording the audio from the lens is essential as brands would want their SFX/music in the lens to be within the recorded video when their users share it on the social media.

See the discord thread for reference: https://discord.com/channels/1044383298002112532/1344543101687042080