This problem happens when both people have screen security mode enabled during their one-on-one chat. If you send an MP3 file and the other person's screen records and plays the audio with the black screen displayed, they can still hear it. The same issue arises with voice notes and audio in videos.
Workaround: There is currently no known workaround for this issue.
Devices Affected: IOS & Android
Experiencing this issue? Please contact support through the app by (1) going to your profile screen and (2) selecting 'Report Problem'.
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Reach our support team directly at help@fyi.fyi.