Dear friends,
We’ve been asked to change some table, as they will be replaced by Dec. 1st. I would like to get some feedback and help on how to upload a list using the new templates, in particular how to ‘connect to data’ works. .
Many thanks in advance!!!
Hi there,
This article might be a good start.
Here’s the full directory of how-tos for connecting content. 
Great article Sheyla!
In addition to that, the old list app is being removed which means anything in the tables are recommended to be moved over to a repeater (article mentioned by Sheyla).
If you need help with your site specifically please reach out to Wix Customer Care Team so they can look into your site and recommend the best steps forward.
Thanks Randy!