The server translates that data into XML-based IDML code, which any version of InDesign from CS4 onward can read. Best Practices for a Seamless Conversion

This requires the original creator to be available, willing, and technically savvy enough to export the file correctly.

One-off conversions start at $10; Pro subscription at $79/month (up to 1,000 pages); Enterprise pricing available with API access.