Minecraft expects the manifest to be at the of the archive. If a folder is inside, it fails.
Troubleshooting
However, the rename method is faster and preferred for one-off installations. how to convert zip to mcpack
: Use an app like CS File Explorer or ZArchiver from the Google Play Store . Rename : Locate the downloaded .zip file. Long-press the file and select Rename . Replace .zip with .mcpack at the end of the filename. Minecraft expects the manifest to be at the of the archive
If you have 20+ texture packs to convert, renaming one by one is tedious. Here’s a batch script. it fails. Troubleshooting However