The organization I do volunteer work for now uses Slack for group messaging and to coordinate events. I have it on my Android phone and on my Windows 10 PC using Opera browser. We had no training in it, mostly it seemed fairly straightforward.
On the PC sometimes the logo in the shortcut will be modified. Sometimes there is a solid red dot in the upper right corner, and sometimes there is a hollow red dot in the upper right corner. I can never find anything new on Slack when I get these, and they persist sometimes for a day or two. When there is something new on Slack it doesn’t seem to do this. I get notifications on my phone when there is something new, and if I’m at home I prefer to look it up on the PC. When that happens, there is no modification of the logo on my PC.
The people I deal with at the organization don’t know any more than I do about it. I’m hoping folks here can tell me what, if anything, these dots mean.