Can I upload to a sub site?

Hey, im having some troubles with uploading to another page. At the moment I got 2 pages. One called Gallery, where it should show my pictures, and a sub site called Upload, where I am supposed to upload. It all works well until the picture is uploaded, then it shows in the upload page, and isn’t moved to the gallery page. I’ve been trying to work this out for quite some time, but without luck.

If anyone could tell me how this can be done, I would be thanksful.

Kind regards

https://www.ads-software.com/extend/plugins/nextgen-public-uploader/

https://www.ads-software.com/extend/plugins/nextgen-gallery/