Unfortunately, the company did not. 
Stashpad Docs was shut down and Stashpad Notes remained usable offline.
I think it might’ve helped if people knew you could add images and if it had file upload support. I haven’t polished this feature in the plugin, but you can link to both via drag-and-drop or copy/paste. Sync isn’t free, unless you use your own cloud solution.
I’ve recorded a short video that’s under 120 seconds that covers a few features. The large home note preview has been changed in the latest update. I also realized I didn’t really add anything of unique value for the community, so, inspired by this suggested post that popped up as I was writing the OP by @osau, I had Claude add some rudimentary Index/JDex building functionality and would love to receive feedback on it and can commit some time to improving it and fixing bugs for it where possible.
Edit: not sure why multiple quote callouts do not render. I will leave them here.
Edit 2: replaced the wrong style quotes with regular quotes. Turned off the setting in the Keyboard section of the settings app for macOS. System Settings → Keyboard → Text Input → Edit → uncheck "Use smart quotes and dashes".