Flash is not compatible with common CMS to change or modify the content
The content on a Flash site is created once and cannot be changed or modified since the technology is not compatible with common CMS. Changing even the smallest piece of information involves high-level skills and a lot of work.
How to maintain easyly Flash content
The misconception that Flash is very hard to maintain stems from people embedding content directly inside their Flash movie. Then when they want to update their content, the blueprint document (.FLA) must be re-edited, re-exported (.SWF) and finally re-published on the Web. That’s a very non-friendly process that could potentially be very costly.
Three-tier architecture
It is strongly recommended to use what we call 3-tier architecture to build your Flash. This type of architecture ensures that the content (raw text data) is separate from the presentation layer and does not mix with code. Externalizing your content will help save you weight when you have multiple language applications and allow the author to change variable content of the site in a much easier, more simplified manner.
Content management systems for Flash
You can also easily use a CMS to maintain your Flash content. Flash can interface with a lot of back-end systems using several means of communication, including XML, Web Services and AMF (ActionScript Message Format), a proprietary data format created by Macromedia used to share Flash core data types.