The simplest way is probably to add a Wall Shadow, Point Light Finalize sheet effect to one of the last sheets in the list, check the Shadow Color is ambient light box and pick a nice bluish colour. That way you can turn the effect on and off.

Can you show us a screen shot of the Bevel effect in edit mode, so we can see how it is set up?

Perhaps that is a bevel?

I was having reception issues in that moment with slow broadband, but the usual way is by Insert File in the Draw menu.

Yes.

If you have any questions about specific symbols or fills you have modified, and which you wish to share with others, it is probably best to contact PF directly using the Licencing Questions email address on the Contact Us page: https://www.profantasy.com/service/default.asp

However, this is about giving the symbol itself away. You can use all the modified symbols and fills that you have made in your own maps, whether or not they are commercial. It's just the individual assets.