Unable to upload STL files from iPad to websites

Hi. Is there anyway to directly upload a STL file directly to a website?

On my ipad, whether I use Brave or Safari browser, the website I’m using allows to upload files by selecting on your device.

When I go to get my file on the ipad in the files section, it remains greyed out so I select to upload.(any file in any folder for that matter remains greyed out).

For the same file on my windows computer, it’s not an issue and can be selected and uploaded.