Instead of numbers and letters, squares are displayed in the running apk file, how can I fix this?

Question

C++ / C#

If you use Tex Mesh Pro, then there is no such thing, but everything is already done with just Text. Is there a possibility to fix this?

Answer 1

You have a problem with a shader\material
You most likely specified some kind of your own material, the shader of which is not supported on the device.
For example, any shader not intended for ui gives such an effect even in the editor

Answer 2

99% that the problem is in the font. Make sure it is in the project and used in the specified Text.
The second option is that the font you are using does not contain the required characters.