On mobile, you often need a file manager app to bypass system restrictions.

No. You’re only changing the file extension. The internal data remains identical.

Minecraft expects the manifest to be at the of the archive. If a folder is inside, it fails.

The most direct way is to change the file extension in your file explorer.

If you are unable to rename files on your device (common on some school or work computers) or the rename method fails, you can use an online converter.

This guide details the methods to convert a ZIP file into an MCPACK file safely and effectively.