Can I use pool epoxy to fill gaps between coping and tiles? Attached pic

First of all, don't let your pool overflow.

You will never be able to seal all the gaps. And if you think you do new ones will open up.



I doubt much, if any, splashed water finds its way into the crack.



Water that got in there during the summer will not be lying in wait to freeze in the winter to cause damage.

Water evaporates pretty quickly.
These answers were super helpful. Thanks so much @ajw22
 
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