Photoshop :: Multiple Fade To Transparent Gradient On One Image

I am having a little trouble trying to add multiple fade to transparent gradients appear in a single image. Here are the steps I have done so far:

Create a new vector with the photo unlocked

Add a layer mask

use the black to white gradient, so the edge of the photo is completely translarent and as you move to the center, it slowly reveals the photo.

I used this technique I found online for one edge of the photo and it worked great, untill I tried the second gradient on the same photo, and the first one I did disappeared. I guess Photoshop only lets you have one.

The next thing I tried is to create another vector mask and create another gradient, but it did not work at all. Also, Photoshop only lets you have two vector masks per layer, so That wont do me much good if I need 4 gradients, each one fading to transparent around the 4 edges of the photo.

Any solution would be greatly appreciated. I plan to take the photo that has the fade to transparent gradients and copy it to another background image with some text.

Thanks a lot in advance,
Jake