Drawboard Projects treats Documents as secondary project documentation that supports the primary Drawings. As a result, Documents don't go through the same strict processing as Drawings do and have no page limitations.
Note: you are only able to upload documents via the web, you cannot upload documents in the iOS there is a link to the web in the Windows 10 app.
The Documents section contains all files uploaded as a Document and also any file added to the project as an attachment.
The Documents section is the perfect place to add any supporting documentation that may need to be referred to throughout the project, such as the project brief, technical specifications, product specifications, approval forms (signed and unsigned), design reports and any sketches or calculations.