[Katarzyna Kuzawska]

Maybe you should use Image->Resize Image (here you can set Resolution and size) with Scale Styles option marked.
Then after resizing the whole image , you can replace with your new better one. It’s good way when u were applying changes on Adjustments Layers. But if you were editing pixels of your Image directly it’s impossible to apply automatically these changes on new one.

[Katarzyna Kuzawska]

I have and advice for you ( if you use Adobe Master Collection or u have access to Adobe Illustrator)
As you can see it’s not a standard Gradient, not Linear, nor Angle…It’s exactly Mesh Gradient (unavailable in Photoshop). So you cannot make the same gradient as on the image simply, you would have to combine Gradient, Blurring, Smudging…
It’s far easier to do it with Adobe Illustartor .
You can use Mesh Tool , making such a gradient will take up to 1 minute in Illustartor, bacause Mesh Tool is extremely powerful and simple tool ???? One more idea is to copy it then to Photoshop as Smart Object , then u will be able to make other operations in Photoshop with possibility to change the gradient in Illustator anytime you want 😉

[Katarzyna Kuzawska]

It happens when you select 2 layers and then use option Merge Layers, it’s useful when merging more than 2 layers.
If you aim to merge TWO layers, you can use option Merge Down – then the new layer will be named as the bottom one 😉

[Katarzyna Kuzawska]

I was trying everything same as you, but i found the solution by accident ????
Try to :
Play RAM Preview (NOTE: YOU MUST do this via Menu->Composition->Preview -> RAM PREVIEW)
Then your composition preview should start to play automatically.
To enable the sounds just click any point of playing preview.
It’s not intuitive, but worked for me ! Try this.

Why you need to play preview via menu? Because if you start it with button on the rightside (in Standard Viewport) ,
then clicking on playing preview will only stop your video.