On Android phone: When trying to upload a GPS trace, why can I only select image files?

On openstreetmap.org in the Upload GPS Trace menu: When I try to select a file, only image options are shown (i.e. Camera and Media selector).

Is the site telling my smartphone that it wants an image file??

I have checked in other apps that the GPX file I want to upload does exist.

I am using the browser Chrome on an Android phone.