Jira is not a file sharing system, it's an issue tracker. The project header doesn't have a lot of configurable items, it's mainly for configuring the project. The best you could do off-the-shelf is either say "issue-1 in this project has all the attachments I want to share" or put a url pointer to a file sharing system in the project description text (Most places I've worked have a matching Confluence project and put the information/attachments there)
There's a plugin to provide project level fields, but I'm not sure it includes a way of handling files at a project level.
The plugin mentioned lets you add project level fields to your JIRA projects. Check out https://marketplace.atlassian.com/plugins/com.deiser.jira.profields
I am not sure it allows you to add "attachments" to the project as you looking for but you could possible take up this discussion with the vendor of the plugin.
Meanwhile i vote for Nic's suggestion to add a ticket containing the uploaded files for the project and link to it in the project description for example.
Badges are a great way to show off community activity, whether you’re a newbie or a Champion.Learn more
...attest to the experience of an urgent approval that gets lost in the boss’s inbox and requires that special “Please Approve” email or text message. In an age where we have distributed teams...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs