File Name- Jenny-makima-addon-mcpe-1.21.mcaddon Link

This usually means the mod was designed for an older version of Minecraft (like 1.20) and lacks the proper file structure for 1.21. Double-check that your file explicitly states 1.21 compatibility.

There is a major security detail to remember. The correct installation method for Bedrock Edition is strictly the .mcaddon or .mcpack file. File name- Jenny-Makima-Addon-MCPE-1.21.mcaddon

Two spawn eggs.