I have it selected that they can, but there is no way for them to add attachments. I just downloaded this today, so it is possible I am doing something wrong.
Paid Addons Support Forum Only
Please note, that here we only support Paid Addons issues and questions.
gVectors Support staff works from 6am to 6pm (GMT+0)
All questions related to wpForo and wpDiscuz free plugins should be asked in the corresponding plugin support forum:
[Solved] Subscribers Can't add Attachments
wpForo has a New User Control function in Antispam settings. It allows you to set a minimum number of posts user must have to be able to attach files. Please navigate to Dashboard > Forums > Tools admin page and manage the mentioned option in Antispam > New Registered user section. Set it 0 if you want to remove this limit.