Flash files having .swf extensions can be added to blog posts,if you have got the embed code for the same..The best example is the youtube embed code!!IF u want to add flash to the blogger tile.In that case you will have to edit your template and add the flash embed code there..
See a sample of what can be done below, doesn't this look cool!
Read on to see how it's all done.
Now see What i have doen Above.
In my one of the previous articles i showed you how to add music files to blogger.
Adding flash is somewhat similar to it.
The code i have used for above flash file is:
<object width="100" height="100">
<param name="movie" value="cooldots.swf">
<embed src=" http://h1.ripway.com/funwithblog/cooldots.swf" width="100" height="100">
Code For above swf is :
<embed height="101" pluginspage=" http://www.macromedia.com/go/getflashplayer" src="http://www.amarasoftware.com/valentines-animations.swf" type="application/x-shockwave-flash" width="400"></embed>
You can use Any of the above code directly to your own blogger
http://h1.ripway.com/funwithblog/cooldots.swf or http://www.amarasoftware.com/valentines-animations.swf
with your own flash file url.
Change height and width according to your own
Now,the only question left is where to upload.
i think the best option is google sites or you can upload to any free webhosting like i used ripway