If you choose the setting for 'Desktop Website/View' on your phone,
then you should get a better view of the PDF Files and Pictures.
At the top of the PDF File is a small menu which includes
a plus and minus button to zoom in and out.
I created gaps and a 'space' on my Word program between the video links,
so that I could place the video in the gaps, which works well on the PC or Laptop.
But the video's are all placed at the bottom of the screen on a mobile phone.
But all of the same information is available on a Laptop, Mobile and PC.
I have not finished organizing the layout of all the button links,
videos and the view of every page for a mobile phone,
(I've gone through around 60 of the 200 pages!).
A PDF example is shown below.