[Q] Phone not recognizing some media files (SD Card) topic

So I bought a generic Android phone and almost everything is in place. The phone seems to have a problem recognizing some media files, I've tried formatting the SD card, no luck. I've also tried to convert them in different formats, only some additional ones show up. I've also tried to change the location of the files, but again only 1 or 2 more are recognized.

I don't think it's the Micro SD's problem, I already checked it on my computer and the files are intact. My tablet is also recognizing all the media files properly.

Does anyone know why this happens?
Solution?

System Information:
Android 4.3
Mtk6515

Thanks