How to connect a card in page with an html file?

Hello, I am new to this app making so this question may sound no-brainer. I have an idea and am working on it. I am trying to create an app and have created few pages. I want a feature where one click on a card will open an html file (storyline file) which is stored in the cloud. So for this I guess I have to store my files in cloud and then somehow put the url in the designated area in appgyver. Please help me out with this.
What I tried and failed -

  1. I created a bucket in google cloud and put my folders and files there. The copied the url and pasted in the REST API intefgration field, but that is not working.
  2. I am unable to upload ‘folder’ in firebase.