Inserting a macro that adds slide number to every slide

This is a feature we intend to add in a future update. It's not available just yet, but I know it's on the list. The best option for now is to manually add a caption to one slide, position it how you want it to appear throughout the show, then right-click on that caption in the "Layers" tab (on the left-hand side of the program) to select the "Copy" > "Copy to All Slides" option. You'll then need to manually change the text for that caption on each slide to match the appropriate slide number. We understand that this workaround can be a bit tedious and hope to have that caption macro feature added sooner rather than later.