Providing that detail will help narrow down the exact fix.
If this is a DRM issue, ensure the machine is authorized. Open Apple Music or iTunes . Go to Account > Authorizations > Authorize This Computer . Log in with the Apple ID used to purchase the file. laxmi won t let mamp4
Security protocols often block media files like .mp4 to prevent bandwidth drain or the introduction of malware via embedded scripts. Recommended Fixes Providing that detail will help narrow down the exact fix