Published HTML will not fully show first slide

Hello All,
I am working in Captivate 2019 on a small project with ten slides; six are just text and shapes for instructions, two are click and reveal using simple show actions (except for an execute shared action on the reset buttons to hide all), one is a click and reveal using multistate, and one is drop and drag. The simple click and reveal slides use either buttons or shapes as buttons for the show actions, the multistate uses jpgs, and all the interactive slide have a png file. All the slides have buttons for next and previous, except first has enter activity (still basically next slide) and last has exit button. There is no java script (I do not know how to do that) and no special coding. The first slide is set at no action for enter and exit as I want them to use the enter button to advance to the next slide
Problem/question: When I publish to html (not swf) and extract the zip on my computer (with windows 10), I can only view the index.html file on Firefox and Explorer. When I open it in Edge, Chrome, or Brave, I get the play icon, then the four squares of loading (and it takes a few seconds) and then either nothing (blank/white screen) or just the shape (no text or buttons) on the first slide. However, if I mouse over the area where the enter button “should be”, I can click on it and advance to the second slide which is visible. Once I get to the second slide, advancing forward works fine and I can perform the interactions. If I use the previous button on the second slide to go back to the first slide, I get the loading gif again and then the slide is still blank (or just the shape shows). I just cannot seem to get the first slide to show.
Bigger problem/question: The goal for the project is to upload the zip and extract it into our LMS (Canvas) for my students to practice terminology. There is no scoring so I'm not enabling e-learning output (no SCORM). When I extract in the LMS and link the index.html file to a module, I can get it to play in Firefox and Explorer. However, in Edge, Chrome, and Brave, all I get is a blank page (not even the play icon) and no mouse over where the enter button should be. Even if I try to open the html directly in the files of the LMS, I get nothing. I have no way to access any of the slides. And I am afraid the only reason the other two work is because they are older versions.
If anyone has any thoughts or ideas, I would greatly appreciate some feedback. My classes are about to begin and I have nothing (unless I require them to use Firefox).