getting System.UnauthorizedAccessException on File.Create – Docker

I’m getting System.UnauthorizedAccessException when trying to create a file using

using (var fileStream = System.IO.File.Create(filePath))

this is only trace i got

Exception thrown: 'System.UnauthorizedAccessException' in System.Private.CoreLib.dll

It’s ASP.NET Core 6 Web API run on docker

Any Ideas? Thanks 🙂

EDIT:
Here is mu complete malfunctioning code snippet:

var filePath = Path.Combine(_environment.WebRootPath, "Uploads");
if(!Directory.Exists(filePath))
    Directory.CreateDirectory(filePath);

using (var fileStream = System.IO.File.Create(filePath))
    await file.CopyToAsync(fileStream);