Here is for detail:

I am using this texture that has less than 1 MB but when the world is loaded, the popups are shown and it says "Resource pack fallback, Low memory, the texture will have a reduced level of detail" After all loaded, I can't see the world, just black. I was so confused about why the file size is below 1 MB and why it should be reduced. the texture is just a shader.

this is the record I made, before I reduce the size:

https://drive.google.com/drive/folders/1YOoLZQsqdn7xJOqpf-o6c-VRVt_JIa6V?usp=share_link