Problems with Mobile Content

GISPro1

I have set up a Hub Site and the Default looks great!  Two Issues:

1. I have placed 2 application cards on the main page containing 2 different experiences.  In a web browser and when turning my mobile device sideways, I can see both experiences, but one of the experiences shows as a grey box when I go back into portrait mode.  
2. I added an FAQ PDF to site contents.  I added a wide card to a new page and manually referenced the PDF.  I can explore the entire PDF in a new tab in a web browser, but I can only see the 1st page on mobile.  Any ideas?

GISPro1

So I created a workaround for both issues.

1. I added the other map as a page in the experience with a menu switcher.
2. I used HTML to link to the source PDF in a wide card instead of adding it manually using a Gallery