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The most common cause of such a problem is the file size.
You are limited to a file size of 5 Mb if you have the free or Bronze subscription to Yola. This goes up to 100 Mb if you are a Silver subscriber.
One possible solution to such a problem is to ZIP your .swf before uploading and when you have loaded it then use the facility in the File Manager to unzip the file. This has worked for a number of users.