Why won't the Unity WebGL game load more than 90% on my phone?

Question

Mobile development

Good morning, I have a problem that I do not understand how to solve, the point is.
There is a ready-made game written in Unity with a platform on the Web (WebGL), they work fine on desktops, but on phones the download stops at 90%. As I read on Google sites they say there is not enough memory, in the end I tried 64MB, and 128MB, and 256MB, and also 512MB. no volume helps.
The project settings are:
Scripting Runtime Version: .NET 4.x Equivalent
API Compatibility Level: .NET Standard 2.x
Strip Engine Code: true
Vertex Compression: Everything
Optimize Mesh Data: true
Memory Size: 256mb
Compression Format: Gzip
Linker Target: Webassembly