Just wanted to bring to your attention that on the front end attachment is spelled wrong. You've it spelled as attachement, the correct spelling is attachment, without that first e.
The biggest issue with that is only on the front-facing sections of the code. I suppose changing it in other places will break database issues.
Hopefully you'll get a chance to fix that issue in the next update.
This is a fantastic plugin BTW. I've been wanting something like this for file sharing for a while and you've really hit on something special with it. This is one of those plugins that supports BP for being used in Enterprise, business and intranet settings. Thank you!