Sometimes the permissions with your iPhone get reset. 1SE needs these to work correctly. To make sure the app has the correct permissions tap on your Profile picture at the top left of the home screen > Settings (gear icon at the right) > "More Settings..." > "Manage Permissions".
This will take you to your phone's settings for 1SE.
Verify that Microphone, Camera, and Media & Apple Music are enabled and that the app has access to All Photos.
TIP: Everything toggled on, but it still doesn't work? Try turning these off and then back on. Sometimes a reset helps.
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Tags: #mic #microphone #camera #photos #library #access