Extension Upload Not working

Hi,

I hope someone can help.

I've got an Opencart 4.0.1.1 installation running on a hosteurope server with php 8.1
I've already set the extension folder rights to full rights. When I want to upload an extension through the website I'm not given the option. All files are grey and cannot be selected. I don't know what the error is and I couldn't find anything until now, so I hope someone knows and can help.

Thanks

1. Your OC v.4.x is not yet a 'final' Release.
2. Older OC Version Extensions will not function with this Version.