Developing Admin Action Extension

I’m developing Admin Action Extension in TypeScript. I have issue when in some point I get base64 of PDF document into code and I need to show/download it. First step was to create Blob URL of PDF and it was done. Next step is to download it or to open it in new tab. Window is not allowed in Admin Action as well as Document, so this is not option. Also creating “a” tag is not allowed. And I had other idea to put this into Link component, but this is not working because it’s not recognized as internal link. Also I had idea to use App Bridge but I’m not sure that this is working too. Any other good ideas?