Can you have two active skins in RH 2020 in the same project? One for mobile and one for html5?

RoboHelp Server is something you use to host your output. It is not a source control app. I'll leave you with Amber on source control. 

I can't comment on New UI, but many years ago with Classic I worked in a multi user environment, so maybe describing that setup will help you. I figure a lot of it will still be relevant.

We only added the source to (ahem) source control. We generated on our local PC and published to the production web server. Generating locally ensured we avoided network problems potentially corrupting the project, as well as very slow processing. Corruption problems were particularly bad because of the cpd file used in Classic. When we upgrade I'll continue to work and generate locally out of an abundance of caution and distrust of our network. 🙂

As part of onboarding we ensured the local folders were set up the same and NOT inside any user specific folders. This was both to keep the path as short as possible, and to avoid the underlying folder name changes using the "My Documents" folder (which is actually c:\Users\MyName\etc, and is an essay when it's directed to OneDrive (nightmare!)). Something like this, to keep everything together and organised:

c:\
  Help\
    Source\
      Project1\
    Output\
      Project1\
        Web\
        PDF\

(You can easily slot in version numbers if you need to maintain multiple version for each project, too.)

Once the folders were set up, then we would set up source control and get the files from source control to the pre-prepared folder locations.

(Protip: Don't forget to document your setup and config in your style guide, ready for when your PC explodes and you need to set everything up again. 🙂   )

Yes, there were a couple issues that I got resolution.  The output issues were related to us using One Drive to host the working set of project files and it was in a different ascii char coding on that drive than our local files so when we would try to publish or generate the files could not be read and failed.  Now that we used a different source shared drive they are generating and publishing without error except for the pdf format... and I think that needs a special TOC? Not exactly sure why that won't compile but I did some testing locally creating a new empty project to find the other issues so I'll try the same with the pdf output option, maybe there is a older corrupt css file or content pasted into the skin it uses that I didn't correct yet.  All in all, what is your recommendation for multiple authors to share one code base/working set and to generate/publish to the same output locations so that when we push our project file to github and then pull it back down the paths stay the same. The three of us were setting the paths to different locations on our local drives and that was causing an issue with output not working as well.  There should be a way to configure github repo for RoboHelp, and configure a remote share for generating the output and then one location for publishing to our server location.  I am scheduling a demo to go over some of the server options, but does our 3 author scenario sound like a use case for using RoboHelp Server?

You have posted I did find out that auto generating the TOC fixed my TOC mis-match highlighting issue. I had to check the box to remove existing TOC and the links are now correctly highlighting with what was selected/clicked as if it is a solution but it seems to be a different issue. Are your outputs now OK as far as this thread is concerned?

I did find out that auto generating the TOC fixed my TOC mis-match highlighting issue. I had to check the box to remove existing TOC and the links are now correctly highlighting with what was selected/clicked.

Do you have separate presets for the two outputs? It sounds like you might be changing the settings each time.

You can definitely assign different skins to different outputs. You can't apply two skins to one output, though.

However, I'm unsure if you need two skins. The "responsive" part of the responsive html5 output means that the skin will adjust automatically for different devices (desktop, tablet and mobile). If you only really need one skin that will save you some work. 

If you post back with what you're trying to achieve and why you need two skins, along with an example of a customisation that works in one skin and not in the other, we might be able to provide more specific help.

Also, please always include the version of Robohelp you're using, including whether it's Classic or New UI, as the answers vary depending on the version.