Linux intro folder

Can anyone tell me where the folder is located in linux for the intro images? It wont allow me to upload when i select add, so i was hoping i could just save them in the folder. Any help would be great!

There is no specific folder, files must be selected. I will take a look if there is something wrong with that on Linux.

Thank you!

Per my tests it is working fine. Do you have a file browser available on your Linux distro?

Weird, But yes, its the full version of Buster.