I would definitely put caulk under the frame, bet. The frame and pan. I think it should be there in first place...
Caulk is a great invention.You just have to know how to use it For your situation, I would recommend you use Silicone caulk.
When you caulk, especially with silicone, the frame and pan has to be ABSOLUTELY DRY. No water, no moisture, no steam. Then, it has to be ABSOLUTELY clean. No soap residue, no shampoo residue, no dust, oil, etc.
In these situations, we use Denaturated Alcohol in spray bottle to clean the surface. You spray it on the surface and wipe it off with clean cloth. Then, you can apply caulk. Only this way we can be assured, the surface is clean.
Caulk has to be given adequate time to dry. Silicone caulk at least 3 days. Latex caulks about a day. Again, no water, moisture, steam during the drying period.
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