Images unable to upload

I was doing Map Image Engine then when i went to upload the image file in images folder it said "You cant upload images here" so does anyone know how to make it so i can upload the image file

Quote from Bluewy

What's the plugin file path to the place where you have to upload them?

What image types all should you be able to upload?

(Filepaths are for example files/plugins/essentialsx/config.yml)

The plugin file path is /files/plugin_data/MapImageEngine/images is the place i need to upload it and im trying to upload a miei image file and its a miei cause it says you have to turn it into an miei file and i did already

i didnt rename it i went on to the site https://faigersys.github.io/mie-converter/ and it converted it into a miei file then i downloaded it