Avengedsevenfolddiscographyitunesplusaacm4a490trtr

What is and how to apply for Mexico’s RFC?

Add files via Music app: File > Add to Library.
Prevent cloud duplicates: if using iCloud Music Library/Apple Music, enable/disable syncing per preference; prefer local-only library if you want to keep purchased/encoded files untouched.

To understand if this is useful, you have to understand what the tags in the filename mean:

Discography: This implies a collection of the band's studio albums, likely ranging from Sounding the Seventh Trumpet (2001) through The Stage (2016) or Life Is But a Dream... (2023), though such packs often lag behind the newest releases.
iTunes Plus: This is a specific audio standard used by Apple until roughly 2019. It means the files are 256 kbps (kilobits per second). This is widely considered the "sweet spot" for digital audio—significantly better than standard MP3s (128-192 kbps) but with smaller file sizes than massive FLAC or ALAC lossless files.
AAC M4A: This indicates the codec. AAC (Advanced Audio Coding) in an M4A container is more efficient than MP3. A 256 kbps AAC file generally sounds better than a 320 kbps MP3 to most listeners.
490: This is likely the file size (490 MB) or a specific uploader/group tag. If it refers to file size, the collection is likely incomplete or compressed, as Avenged Sevenfold's full discography in iTunes Plus quality usually exceeds 1 GB. If it is a uploader tag, the size may vary.
trtr: This is typically the "release group" name (the person or group who ripped and uploaded the files).

Purchase music or rip only from discs you own. Do not share copyrighted files illegally.