How to add a long background for Infinite Jump

I saw another thread which had some answer but I couldn't reply because it was 6 years old.

I created a long background on Photoshop which has different sections to the design.

How do I add the background so that when the character jumps up it goes higher and higher. What I did was create a Sprite which has the background but when I went to preview the game it said the background was to long so it couldn't be displayed on devices.

So I must have done something wrong.

Any help would be greatly appreciated.

Just to give a bit more information about the background and what I've done.

The height of the background I created is 7806px and width is 640px

I created a background tile object and then inserted the background and then scaled it to the game size (720x1280).

Then I changed the image offset Y to -6700 which shows the bottom of the image.

So far have I done this correctly?

Now I want to make the background move when the character jumps on the platforms and when the character falls. The view falls with the character and resets.

Any help to do this would be much appreciated.

I'm guessing what I'm trying to do is not possible?

Been trying to do this all weekend and still can't figure it out.