Alpha channel Texte on video bkg

Fusion 8
Export *.mov
Hi
I want to make a texte clip with the bkg as alpha channel to set on top of a clip by editing. It seems I have my text with the alpha channel but it doesn't work. I already had this problem on ver 7 and I got the Hint to check by the saver the line "attempt to save alpha". On Ver 8 I cannot find this line. I try to attached the *.comp file but it is not allowed I compare the other file I did with ver7 and I cannot find where the set up is different.
So If someone has an idee!
Claude

It was the same problem as before so solve. Sorry about that

Hi Claude.

The "attempt save alpha" only appears on the saver options if you choose a quicktime codec that really permits saving alpha.

In h264 it does not appear:

Clipboard01.jpg (38.04 KiB) Viewed 981 times

But in PNG, for example it does:

Clipboard02.jpg (34.49 KiB) Viewed 981 times

Thank you for your reply. I actually reread the post I reseived a year ago on the same topic but I am just a bit slow in mein 2 bit head computer
Luckily I have people like you. Thank you again
Claude