Can't upload a log in Copter 3.3

Here are the steps:

I type a message
Choose File
Add the file

At this point a pop-up appears indicating upload in progress. I also see at bottom of screen a progress indication. When it reaches 100% the screen blinks and my just typed message disappears. No indication that any attachment has occurred. No attachment is ever made. The pop-up never goes away.

I’ve now tried 3 different browsers IE, Chrome, Firefox, On 3 different computers running 2 different OS Win7 and Win10. I get the same behavior.

Do I have to post a certain number of messages or be a member for a certain period before I can attach a log?