Then, if you upload that .zip file as a theme or a theme component, you will get the Custom CSS/HTML fields that were removed from all but the default theme.
Theme development is not my forte, but could you not just create a new theme on your site to achieve a similar thing? It’s only the remote themes that don’t have the edit css/html button.
In order to manage the evolution of your Theme, just as with any code, it is good to use a system like Git(Hub) to control change.
This will allow you to track how the Theme evolves, easily roll back changes that don’t work or cause unexpected issues, mitigate loss of code (e.g. local corruption, loss of back-up). On the more advanced end, you can then also consider publishing your Theme to third parties and manage contribution via PR.
In this instance, I’m just wanting only to make super-minor CSS tweaks, not to establish or distribute a new theme.
For some unknown reason, the whole Git thing just scrambled-eggs my brain with a very unfortunate barrier (which I’m working hard to overcome!)
There might be others here in this community like me who (currently in their learning process) can only edit a certain amount of CSS which is only accessible through the Custom CSS/HTML settings in the default theme.
