A little play around today and looking at some codes that are working.
Seeing that standard Moodle Atto Youtube insert looks fine and as we know that it is using an iframe that is being handled by the internal Atto Moodle coding. (but we can't see that code when we go to HTML edits). I also had a look at some of our Vimeo videos and they are looking fine via the mobile app.
so I have pulled some of the Vimeo code apart and used it with the GDrive codes.
This is what I get and it looks fine.. the padding can be played with to suit the PPT's in question.
<div style="padding:70.00% 0 0 0;position:relative;"><iframe src="https://docs.google.com/presentation/d/e/2PACX-1vQ4fIJnrWjggro4UIz5Xokk5wMDfwP-gsommd8DOs1g24jjBjae2auZaAcgb2hxOdEPQSeXUIARRSSQ/embed?start=false&loop=false&delayms=3000" frameborder="0" style="position:absolute;top:0;left:0;width:100%;height:100%;" webkitallowfullscreen="" mozallowfullscreen="" allowfullscreen=""></iframe></div>
<div style="padding:70.00% 0 0 0;position:relative;"><iframe src="https://drive.google.com/file/d/1frtLH1cQkDBmclD4h_6UUpgfzM_5qL8u/preview" style="position:absolute;top:0;left:0;width:100%;height:100%;" webkitallowfullscreen="" mozallowfullscreen="" allowfullscreen=""></iframe></div>
Using the format (and dropping in a src="https - As with in the desktop it works with out this but as per last posts mobile doesnt see it).. I am getting Slides.com working fine too.. will need a little tweeking but they are fine for now.
<div style="padding:70.00% 0 0 0;position:relative;"><iframe src="https://slides.com/advancedconstructionskills/70-20-10/embed?byline=hidden&share=hidden" style="position:absolute;top:0;left:0;width:100%;height:100%;" frameborder="0" webkitallowfullscreen="" mozallowfullscreen="" allowfullscreen=""></iframe></div>
Flowpaper also is looking better but the format needs to be played with as the iframe is only going mobile and it would be nice to trick it to use the desktop format..
<div style="padding:70.00% 0 0 0;position:relative;"><iframe frameborder="0" width="400" height="300" title="" src="https://online.flowpaper.com/74cc0732/702010/#page=6" type="text/html" style="position:absolute;top:0;left:0;width:100%;height:100%;" webkitallowfullscreen="" mozallowfullscreen="" allowfullscreen=""></iframe></div>
Of note these do look full page on the desktop, but are responsive so is acceptable.
I haven't had time to play with any H5P iframes out of WordPress to a Moodle site at the moment but I am guessing that this little fix will work.
Hope this reporting back helps out any others that use any of these services.
I am guessing that now that I have worked this out there might be a chance that using a GENERICO template might also achieve this and shorten the coding timeframes for activities creation.
If anyone wants to have a play this code I have posted should work just by dropping it into your ATTO editor and see these in action then head to your mobile app to see how they look.
The Actual PPT is a remake from the folks over at E-Learning Heroes - Articulate
https://community.articulate.com/download/powerpoint-70-20-10/