I'm trying to add users to a document library with basically an "add items" only permission where they can add documents but not edit or delete them. I have it working but users encounter an "access denied" error after uploading a file if metadata information is required for the file. The normal page to enter metadata information doesn't come up and they get the access denied error but the file does actually still get uploaded into the library successfully. Is there a way to grant them the permissions they need to enter this metadata while still only permitting them to add items to libraries and not edit them?

Not out of the box there isn't. The same permission that allows editing is also needed to fill out items once they've been uploaded. What happens is that once an item has been passed through the upload form, it's passed to the EditForm.aspx, which is the same one you'll use when editing items currently within a library. So, natively there's no way (that I know of) to achieve what you're asking after. I'm not sure if something like this can be done programatically.Steven Andrews | SharePoint Professional | http://www.twitter.com/backpackerd00d | https://baron72.wordpress.com/

Thanks, I figured this was probably the case. It seems the only way is to email-enable the list and allow all users the ability to email items to it and still restrict permissions.