Naming and Saving a Document
Saving your work is very important so that you don’t lose anything that you’ve created.
To save a document, click File on the Application bar, and then click Save.
The first time that you save a new document, the Save As dialog box opens, asking you to name the document and to choose a location in which to store it.
Once saved, the new filename, followed by the InDesign filename extension .indd, appears on the document tab.
Once a document is named and saved, you should continue to save your work on a regular basis, such as every 10 minutes. You save the new document with a unique name.