Alpha blend issues

I have a some issues with alpha blend.
For example I have a tiff with his own alpha channel, but I need make addition alpha mask like circle or so. But when I create “curve mask” the curve mask of “freehand mask” totally replace my picture alpha channel. Is the any way to blend two alpha channels (from picture and from curved mask). I already try to blend this by “composite sources”, no result.
Thanks in advance!

I just came to this with the same problem but I’ve found the solution -
In the image plane attributes set the blend mode to Alpha blend and the blend function to Add

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