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Plaster with cement.
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Redo the bottom of the toilet bowl and wipe the bottom seam with water so that it does not leak.
Wipe to see if the angle valve is open, if it has been opened, it may be that the filter screen of the water valve is plugged, close the angle valve and open the connecting hose, take off the filter at the inlet of the water valve to clean it, and then install it back in place, try to ---
Apply glass glue to the crevices under the toilet.
It is the glass glue that is beaten when changing the toilet, and it is necessary to maintain ventilation these days, and you can consider using an exhaust fan for ventilation. It's going to fall away.
Nowadays, many people don't use expansion screws, so that the hole will also affect the waterproof, as long as the silicone can be laid well, and it will be strong.
The following is for reference.
The toilet bowl should be coated with acidic glass glue. >>>More