Local files album art not showing on iPhone

[skzdisc]

Device

iPhone XR, Windows PC

Operating System

(iOS 14.4, Windows 10)

My Question or Issue

I searched a lot for the answer of my question, but they're all old question and I can't seem to find the solving. Yes, I tried everything. The same connection, putting the cover on iTunes, putting the cover with mp3tag, reboot the two devices, cleaning cache, uninstalling and reinstalling, restarting again and nothing works. Help me please