I just got that message working on a flutter app...it may be OS Sequoia being a hater with new security measures...before I updated to Sequoia I could changed audio file pointers inside the apps package contents and the app would still work with the new sounds....I tried this is Sequoia and boom it permanently stopped my app from playing that one sound....even after I changed the sound back...and exported new builds....even with new installs of new versions of the app Sequoia still remembered that file I switched and made the sound mute...yet it works fine on other computers