Hi Andreas,
Thank you for your interest in wpDataTables.

In many cases, you might have an initial file with the table data, but this table needs to be regularly updated (e.g. if it is a price list, a catalog, etc.). wpDataTables has two options here for you:

1.  Creating tables linked to existing data source, in which case you will upload the file and initialize the table, whereupon it will be read every time on page load. Then you can overwrite this file to update the data. Such tables won’t be editable within WordPress, and if they are larger than 3000-5000 rows, the page load and generation time will be slow.
2. Importing table data to WordPress. The initial data will be read and imported from a Google Spreadsheet. You can select to skip certain columns, or add columns. You can edit both the structure and the data within the table at an any point later, but the table won’t be synced with the source file as is the case with the first option but it will be editable on front-end; e.g., if you change something  in source Google Spreadsheet, your wpDataTable data will stay the same because the data will be already imported to the database.

Best regards.