Possibly because getting the rights to use popular music can be expensive and complicated. Also, the style or theme of the story might not match the mood of the chosen popular music.
It could be because the platform or medium you're using has specific rules and restrictions against adding popular music. Some might not have the licensing agreements needed.
Maybe there's a technical glitch or your device doesn't support it. Try restarting and see if that helps.
Maybe there's a technical glitch or your device doesn't support the feature.
Maybe there's a technical glitch or your app doesn't support that feature.
Maybe there was a technical glitch or compatibility issue. Sometimes software updates or changes can prevent adding music.
Maybe there's a compatibility issue with the music format or the platform you're using doesn't support adding music.
Maybe there's a technical glitch. Sometimes, the app or platform you're using might have a temporary issue preventing music addition.
It could be that the platform you're using doesn't support adding music for certain reasons. Maybe it's a licensing issue or a feature that's not available for your account type.
Maybe there's a technical glitch or a setting that's not enabled properly. Check your app settings and see if there are any permissions related to adding music that need to be granted.
Maybe there's a technical glitch or your platform doesn't support it.
Maybe there's a technical glitch or your app version is outdated. Try updating the app and see if that helps.