You can view project attachments from:
My Reminders Hub
Project
Viewing project attachments from My Reminders Hub
To view attachments:
On the My Reminders Hub, select the ...menu in the upper right corner of an activity.
Select View Attachments.
This action will take you to the project's Files tab.
Viewing project attachments in a project
To view attachments:
Open a project.
Open the Files tab.