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The main sewer pipe of the building is blocked, and the sewage is not smooth, resulting in backwater in your home, so you can find the property to dredge it
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You just check the area around the toilet drain to see if it is connected to the sewer pipe.
Generally, it is replaced by a component replacement method, which is to replace it with a good inlet valve or flush valve. FYI.
Take pictures, draw and mark the size, so that others can help. (In principle, there are 2 convections to be well ventilated).
There are two expansion screw fixing holes on the base of the toilet, and now the toilet is directly glued to the tile floor with silicone, and these two holes will produce small flying insects if they are not sealed with silicone.
The upstairs water pipe was not tested after installation, and a professional supervisor should be asked to investigate the site.
Find a professional company to identify the leakage point with professional technology and equipment, and the remaining problems will be solved.