And* select all file expect folders and description file and copy or move to root>system>media>theme>default. In the default folder past all file that you copy.This is all.
For safety copy the (dafault) folder to somewhere.
This way is full working without changing the default theme because the default theme is the theme that you added😂😂
I found this way with no error.
Please Share my post to known this way for MIUI devices.Thank😍