When I try to attach files to a post with Manage Attachments, the file upload seems to never finish. I am able to select files to upload, but when I click the upload button the page never stops loading and never finishes.
There are file size limits so make sure your files are not too large. I’ve also had to press the upload button a few times to make sure it uploads.
I don’t think I’m going over the size limits; I’ve only attached files a few hundred KB in size.
The slightly odd thing is that I’m able to attach files in a post if I leave the site and come back later in the day.
Maybe the format of your file can not agree with the default one.