What you are possibly missing is registering with Adobe (it’s free) to use the embed SDK.
There are instructions on this plug-in page of how to do that - you can likely just paste the code and a viewer will work but you need to register with Adobe.
https://pdf-annotations-adobe.bubbleapps.io/version-test
has instructions on how to setup and register with Adobe here (you don’t need to use the plugin, but it has a lot of helpful setup advice)
This plugin is also for annotating pdfs, saving the pdf files to Bubble and viewing - using the Adobe embed SDK…
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