It is best to fold the work and put it in a plastic bag, and the mouth of the bag is sealed with tape paper to avoid water.
If you support it, it is best not to fold it. When it is folded and then installed, it usually needs to be removed and reinstalled. Then it will be rolled up on a tube and mailed out.
You can't find the stick. The stick is not very round, it is tapered (even if it is invisible to the naked eye), and it is not as thick as both ends. To go to the painting shop, you only need a paper tube. The paper used in their mounting machines is all scrolls, and the paper tube inside is generally not used (some people use this inferior paper tube as the shaft below the vertical shaft, and the sand should be filled inside). If you are stingy, you may be asked for fifty cents.