In version 1 of SuAVE you can publish local CSV files. The publication process and data formatting are described in these documents available from the Tutorials page:
Survey Publishing Step-by-Step
In version 2, SuAVE can additionally import CSV files from a web URL, or retrieve data from a URL each time SuAVE loads. The latter is especially useful if you have independently updated data files, eg google spreadsheets or files generated on database queries.
A reference to a Google sheet that SuAVE can accept looks like https://docs.google.com/spreadsheets/d/1_XwupwRD-Y-wz3NIeft4uq4dvXZmIIv8o2tekHKk8jA/export?format=csv&gid=886577023