How to scan files for malware

I read that many files can have embedded code:

*documents (.doc, .docx for example),

*graphics files (.jpg, .tiff, .png for example).

I think that was referring to files on a Microsoft Windows.

I have 25,000 files in my cloud drives: iCloud, OneDrive, GoogleDrive.

Some of them are redundant, for backups of backups.

I stored some .mp3 files in iCloud in the last year.

I recorded them using an iOS app.

All the files used to play. But now some don’t play.

I wonder if they’re corrupt, possibly with malware.

Is there a way to scan files before trying to open them?

I used to do that with Windows Defender.

(I left Windows years ago after a hacker destroyed

my Surface Pro.)

I use an iPhone SE (2020) and an iPad Pro 12.9 (Gen4).

iOS is up-to-date on both devices.

I bought a year of Norton 360 anti virus.

They said “iOS doesn’t need anti-virus protection”,

but what if one of these files has malicious code?

Does iOS (like MS Windows) execute code in these files?

For now, I’m continuing to use Norton, because I set up a VPN and

also installed their Identity Theft software. I don’t trust it’s working

to protect me.

I’d like to know if iOS auto-runs code in any file.

Obviously it would need to be iOS-compatible code,

but that could be written in Java, JavaScript, Swift,

C++, Xcode, etc. (and compiled properly).

I’m having to learn way more than I ever wanted to know

about malware. But I’ll bet I’m not the only one

wondering about how to fortify myself against all hackers.

Thanks!