First off, welcome to the community, @darkvenus! I appreciate that you solve your own issues on the Internet! I love that initiative! I may be way off here, but what happens when you click your sideways triangle to the left of your Object Transforms label?
The one circled here:
Even though I deleted all other objects from the outliner except the sphere, the file could not be shared because it exceeded 24 megabytes.
I have one more question. I deleted all the files in the outliner, why is the blender file over 24mb?
Thank you. When I pressed the triangle you said, it became like below.
Blender is an attractive tool. However, it is difficult to learn the animation part, because there seems to be insufficient data on the Internet compared to modeling and rendering etc.