Hi Alex,
What procedure are you following to embed your flash files? Although I never tried with self-hosted flash files, my intuition says it should work regardless of where they are being hosted.
The procedure I recommend is, once you have your .FLVs uploaded:
1. Enable the Media button in the UTMCE settings.
2. Create a new post or, if you already have an existing one, Edit it.
3. In Visual mode, place the cursor where you want the .flv to appear, and click on the “Insert/Edit media” editor button.
4. A popup should show up with a form to fill in.
5. Make sure you choose “Flash” in the “Type” dropdown and paste the URL of your self-hosted flash file inside the “File/URL” field. You may also adjust the desired dimensions of the object element by tweaking the Height and Width settings.
6. You can play with a bunch of other settings, but the ones I mentioned in 5. are the most important ones.
7. Click on “Insert” and then preview your post: your flash should be displayed correctly.
You can use this demo post we’ve created as reference.The flv was embedded using the same technique explained above, but the code post is slightly more complex than what you need because the flv links to another page.
Don’t hesitate to let us know if you are able to make it work or if you need further assistance.