Is there a way to automate data uploads to a simple wix website (not stores or blog) through Make.com? I mean through the CMS, to add items to and update collections?
Wix has API endpoints for data/CMS, see About the Wix Data APIs
To do this, you can try using the Wix “Make an API Call” module —
Performs an arbitrary authorized API call.
For more information about the Make an API Call module and Wix app, see the corresponding Integrations page and the Help Centre documentation.
Hope this helps! If you are still having trouble, please provide more details.
— @samliew