When exporting a plugin from usetrmnl.com, it will contain 6 files:
shared.liquid
settings.yml
quadrant.liquid
half_vertical.liquid
half_horizontal.liquid
full.liquid
To be able to import a plugin, it must have at least the full.liquid and settings.yml file present, otherwise you will receive the error:
The ZIP file does not contain settings.yml
If you are sure the contents necessary are present and well-formatted, then it's on to some other troubleshooting steps.
Private Browser Window (Incognito)
Launching a private window or tab is a great option when you want to make sure a browser extension isn't interfering with your upload or other functionality, because, in most cases, they are disabled in an incognito window.
However, sometimes it may be your browser, e.g., Safari.
Try a Different Browser
While we do test across all modern browsers, a variety of factors, including system installed programs, can interfere. So, use another browser, like Firefox, Chrome, or Safari to see if the error persists.
Export an Existing Plugin
Since we can trust our export to be well-formed, export a private plugin and then try and re-import that same file. If it succeeds, it confirms the browser is working and that your original .zip file has an issue.