So, I've been trying to add textures to my worlds because it's getting old seeing the same look of cobblestone. I've tried everything I can, downloading .mcpack files, going to ps4 menu and to saved data management, but the files I add to my USB stick dont show up in that stick, I've also tried formatting the USB, but to no avail. Anybody have a solution?
Sadly, the PS4 edition of Minecraft Bedrock can't import custom packs from .mcpack files. Only the Xbox One, Android and Windows 10 editions of the game can do this.
Your only option is to use the Minecraft Store and obtain content with Tokens, or purchase the same content from another platform linked to your Microsoft account and then download it in your PS4.