How to Fix Pixlli Textures Not Showing Up
First Checks
If blocks, GUI, or font look unchanged after enabling Pixlli, the pack likely isn't loading. Open Options → Resource Packs and confirm Pixlli is in the Selected column and sits above any pack you want it to override. Then press Done to force a reload.
File and Folder Problems
The most common cause is a nested folder. Minecraft expects the pack's assets folder and pack.mcmeta at the top level of the .zip. If you extracted the pack and it created an extra folder layer, the game won't read it. Re-zip so those files are at the root, or drop the original .zip back in.
Version and Format Mismatches
A pack built for a different game version can load but show missing or purple-black textures. If only some textures break, that's usually a format mismatch rather than a bad install. Try the pack on the version it targets, or accept partial coverage.
Reloading and Testing
Use F3 + T in-game to reload resources without restarting. Check the main menu font first, since Pixlli's font change is easy to spot. If the font changed but blocks didn't, another pack above Pixlli is overriding blocks — reorder and reapply.