Yes indeed, the small upload section in the bottom left corner appears directly from the plugging dashboard “Add plugging instance”, and there is no way to move its position on the page or hide it in the parameters.
And the bigger upload box in the bottom center comes from a shortcode I’ve added in a single block section.
When I delete the Uploader Instance 1 linked to my page in the control panel, it removes the small bottom left section from the page but the shortcode used in my block (the second big upload instance) is still working actually, but I do not want to proceed that way, I guess it may cause problems in the future.
Thanks