Lightroom Classic: Publish Service Unpublished Photos Indicator

Hmm, when you select multiple collections and click Publish (without holding down Alt/Opt), LR publishes all the selected collections. 

It doesn't appear that holding down Alt/Opt does anything different (other than change the button's label to Publish Selected).  

 I agree that publishing many collections simultaneously can be very slow. In the past, it has crashed Lightroom for me. I haven't tried doing this in a long time, but I'll try it again and see what happens. {Not holding my breath}

I use Any Source regularly to publish and update many dozens of collections with many thousands of photos on Flickr and Zenfolio.  I regularly publish 4 to 6 collections concurrently with those services, mainly because they are so slow and flaky, often terminating with a server-side error after ten or twenty photos.   But I've never experienced LR 7, 8, or 9 crashing.

Flickr used to be horrendous but now that they've been bought by Smugmug, it seems to be more reliable. Zenfolio has its ups and downs, and if I have a lot of photos to publish, I wait until the evening when it seems less loaded and more reliable.  Downloading comments from Flickr can take hours for a collection with a thousand photos.

(And though I'm retired from Silicon Valley, I still very much develop and maintain plugins -- not dead yet!)

Hello John. Good to know you're still in the Lightroom Plugin business. I'll check into your plugin. Retirement is the best gig I've ever had. I hope you feel the same way.