In the Files section found in the Scope tab that you can see in the following image, you can upload and download any files that you find useful or necessary for performing penetration tests on the group.
You can add them by clicking on the Add button and then the following window will show up
Here you can look for the file that you want to upload, which cannot exceed a size of 100 MB, and also add a meaningful description for the usage or purpose of the added file. After this you can click on the Proceed button to upload the file or the Cancel button to dismiss it.
When you have uploaded a file successfully it will be added to the table and if you want to download it, you can click on it for the following window to show up
This way you can easily download or delete the file that you selected.