Flatten doesn't work with multiple objects?

I’m new using figma, and I was doing a design with multiple lines and shapes, when I tried merging all the objects with flatten, most of those objects seem to dissapear, or become invisible, I was doing this because I wanted to use a gradient, they are all in a group and I flattened them in different layers so none dissapear, but the gradient option is still not letting me move the gradient because I have multiple objects.
How can I merge all those layers so I can apply a gradient and move the gradient around?
Sorry If it’s confusing, I’ll answer any questions. Thank you!

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