Add more than one file in the experiment description

[PauloCabral-hub]

Hello,

For us that use NES for designing experiments, sometimes is useful to be able to attach more than one file to the experiment description. For example, some experiments must have a text of the project submitted to the ethics committee as well as the file containing the approval of the ethics committee. However, in the section bellow, we are able to attach just a single file. Is it possible to create the possibility of attaching more than one file in this part?

This is an issue in response to a conversation with @kellyrb.

Thank you guys